Jungler: Rengar

Rengar is now available. While I suspect he's better suited to top lane, he's a very capable jungler.

Rengar's passive makes him extremely effective at ganking side lanes or ambushing opponents in the jungle. The prevalence of brush in these places essentially gives him free, infinite gap closers on any targets that stray near to brush. Normally brush is a safe-haven for champions escaping a gank or through the jungle, but not against Rengar.

Rengar's overall kit is ideal for gank-heavy jungling. His auto-attack reset/nuke/attack speed buff gives him the damage needed to deal with buff camps and champions. His primary clearing tool is also a defensive steroid and sustain source, giving him built-in tankiness. That tankiness allows him to build damage/utility items early on without being a liability in team fights. He also has a ranged slow/root and, after level 6, the ability to bypass wards. Rengar's exclusive snowball item, filled with utility delicious for jungling, is just icing on the cake.

What Rengar doesn't have is strong initiation. While he can suddenly appear and potentially slow/root someone, his lack of followup CC is crippling unless you're catching an opponent who's way out of position. If Rengar is jungling, you'll be looking for your initiation elsewhere unless he's very fed.

Still, he looks to be an extremely fun jungler, and Shaco-level in his potential to abuse thoughtless or careless opponents.

The rune page suggested in the spotlight is fine, but you'll want to skill QWE R>W>Q/E rather than maxing Q first. The defense and clearing power of W is simply superior to the meager returns from ranking up Q.