Jungle Champs for S5?

Just from experience on the PBE... (And I know. This one will surprise you) Skarner. Starting Gromp or Golems with smite gives him one of the healthiest and fastest S5 clears. But unlike a lot of other junglers that have trouble sustaining the S5 jungle, he has decent dueling strength. With the new skin coming out people are probably going to catch on and he'll likely have a small popularity boon.

People who already have a rough time sustaining or rely on hyper fast clears are suffering right now. Yi and Udyr are having a tougher early game and I feel bad for Sejuani players everywhere. (Though I might just not have seen the "right" way for these guys to S5 jungle yet)

I haven't seen Amumu, Nautilus, or Rammus sort of junglers much. I don't know why, they have relatively healthy clears (People will say Naut doesn't but start golems and then red and he does great). They'll probably be the only sort of junglers with poweful ganks pre-6. (With exceptions, as always coughXincough)

Actually, I haven't seen or played Xin in the PBE jungle yet but I get this feeling he'll be pretty strong.

This is just my opinion from PBE experience. Food for thought. Anyone who has experience with these champions is free to correct me (Except Naut, if you tell me Nautilus has a bad sustain I'll disagree). Keep in mind that smiting (not killing, just smiting) golems or gromp give you buffs that help your clear. Both give Level 2 right off the bat. Both spawn at 1:55. So starting gromp or golem is going to be a lot more popular (and probably more efficient)

I have been playing xin recently and he is really good but i feel like i should have some health in my build as well. I agree that amumu will be great next season! Especially where league is going with sustain. Never thought about skarner though I will definitely try him out!