Keep in mind this is all purely opinion and I do not speak for the competitive level. That said, I've used each of these junglers so far and have fought against them as well both losing to them and beating them a few times. I firmly believe you learn more about champions from playing against them than playing as them - at least in terms of their strengths and weaknesses. That is not to say you should assume you know everything about a champion when you've only ever faced them but that it becomes easier to separate what contributed to your success (or failure) with x champion in terms of your personal skill/knowledge contribution and the champions natural abilities.
Overall the Season 4 jungle choices have stayed pretty much the same but the changes have allowed a few junglers to rise above the rest. Not surprisingly, a lot of these junglers were already powerful junglers and were dominant at some point in Season 3 but indirect changes have allowed certain aspects of their jungle prowess to shine brighter or once again. This list might not surprise many people and it may disappoint a few others but it is as I said, the transition between Season 3 and Season 4 has caused only a few stirs in jungle choices.
Now before people start to crucify me, I must be very clear in mentioning that I am not doubting Riot can still make changes to the game nor that ways to make the jungle work can be discovered. Currently the jungle game is rather nerfed in direct and indirect ways - without even having to mention targon. Normally I would be able to defend jungling against people who say "jungling is useless! Two duo lanes are the way to go!" but I cannot do so this time. The jungle received some very questionable changes that were essentially disguised as "positive" buffs. There were plenty of players who recognized these changes as nerfs yet there were plenty of players who were easily mislead - intentionally or not.
Riot has a bad record of pre-season releases that's for sure. I do have hope that eventually things will be sorted out as they do have a track record of fixing pre-season woes - at some point at least. That said, it is debatable which pre-season is the worst as they all had something incredibly broken about them. Season 2 had most players severely deprived of gold (junglers especially) while Season 3 had black cleaver destruction. Season 4 currently has targon imbalance and junglers being essentially useless. In order to help this make sense to everyone, I will be detailing some information from past seasons. A lot of players look at Season 1 jungle fondly, a lot of players look at Season 2 with dread, and I look at Season 3 with love.
The topic of this article is rather self-explanatory and it is a question that a lot of players have been asking themselves. Some players are making the obvious assumptions while others are being a little radical with their guesses. The thing is that the transition between Season 3 and Season 4 jungle will not be so drastic as to completely eliminate most jungle choices. However, as with any changes, it does give a few champions the potential to change in position whether or not it is to drop from the face of the earth or rise to stardom.
Keep in mind that these assumptions are made without all the Season 4 changes placed into the pbe and before Season 4 is officially released. Plenty of changes can still be made that can either cement some of these predictions or remove some of them. I will describe only the champions that I feel will receive a big jump in power (or decrease) while only making a small note about which champions will probably be strong but are not worth writing too much about. This list is for junglers who's jungling will be the most affected (in my opinion) but not necessarily the ones I think will be the strongest.
The season 4 jungle has become available for testing in the pbe (though changes can still come) and I have been able to test paths with different builds, starts and champions. There is far less to actually test out this time around compared to the transition into season 3 though. Most of what has been implemented cannot really be fully tested as it involves actually gameplay. Things such as the totems, the new items and spawn times can only have their effects observed after players are throw into a game against each other with the intent to win instead of "testing." That said, even the initial results from the first games of the new season will hardly be conclusive. Most of them will have the most obvious uses of everything taking place while more elaborate strategies start developing.
With all that said, there were a few changes made to the jungle itself that could be tested, at least on the PvE side of things. I could only make theories about some of the PvP elements as those cannot be tested until the changes reach the live servers. Unfortunately, the pbe has plenty of players of dismal ability which can completely sink the ability to actually test anything worthwhile. Still though, it was very important to test the new wight camp, the new gold items and the changed monster camps. Riot is telling the players that the jungle will provide more gold and better chances for the junglers to carry while still balancing it out for ganking junglers and such. So far I've had positive results but there are variables that taint it a tad. The fact that I am doing it with no need to gank, no risk of invasion and that ambient gold has changed, affects the final conclusion of this. Yet still this information has been proving useful. I've been constantly grinding clears to refine the paths and to find the most efficient way of doing things. I am still tweaking things so I may even change these still.
Season 4 is nearing soon with all its changes and it has people excited, scared and worried. The jungle is getting entirely reworked (again) and it brings with it the knowledge that Riot has not had a good track record of making the jungle work with every seasonal change. With as much respect as I have for Riot, they blew it with season 2 and early season 3. I have had the most fun playing in the later season 3 jungle than in any other jungle including the breakneck season 1 jungle. I personally feel a bit sad that I will not be able to experience this type of jungle again but I am still hopeful that the season 4 jungle changes work well.
There are plenty of changes being thrown at us. For starters, there is a new camp being added next to the ancient golem which consists of a lone "wight" monster. It is as powerful as the lizard and blue buff but we have not been made aware if it gives us any buffs though it is rumored that the blue buff will give cooldown reduction while the wight camp will give mana regeneration. As far as I can tell, it exists solely for single target junglers to have a camp they can clear that better suits their style while the AoE junglers can still just clear the small camps. This is actually a pretty smart idea. Junglers that utterly destroy the jungle can use both the small camps and the wight camp for extra gold. This is aimed to help farm junglers and help them achieve carry status.