Uhh could it be that... you could jungle with almost EVERY champ now?
Sure, some picks are still outclassed by the plague of Sated Devourer, but seriously. I just won a jungle Orianna game. Before, my jungle mains have been Singed (AP/HP with Runics) and Lissandra.
Marksmen and Fighters have always been able to jungle somewhat well, tanks also due to their ganking power. There was only one class left out-
+
seems to make most mages somewhat able to jungle. Also, some AP assassins I guess.
The only problem with thsi right now is the snowball meta. Since you can't gank very early you have to trust your laners to not lose the game before you hit level 6 - because then your ganks can be devastating as most mages have cc and damage in their kits, plus mostly AoE damage to help with the clears. Seriously, level 6 Liss ganks are like Warwick ganks on steroids! O_O
New champions that might be ABLE - not necessarly better than the current top picks, but who can do stuff - right now could be:

Sure, you have to kite jungle camps around a little and you have to be EXTREMLY cautionous when it comes to enemy counterjungling. Some of these above I have tried already woth success (Lulu for example), some I have seen being brutally OP on other palyers (Rumble in this case) the rest is speculation, but I tried to include everything that seems reasonable with either gapclosers and/or cc.
Now, if we could tone the top jungle picks down a little, this season might potentially be the most diverse jungle in the history of league...