Karma: Now gains Mantra charges on kills or assists.
Udyr: Because he has no ult, instead he receives CDR and reductions in mana cost on all of his stances.
Now for the easier champions to do this for:
Leona: Slow duration increased. Stunned enemies are now slowed after the stun wears off because of this. Also, slight increase in radius.
Lulu: Now does damage in addition to the knockup.
LeBlanc: Mimic: Sigil now pops the silence/bonus damage the instant it's applied. Mimic: Distortion damages all enemies en route to its destination, and has an increased AoE on arrival. Mimic: Chain now instantly snares.
Amumu: Enemies caught are now silenced.
Nautilus: On the way to its target, the "explosions" are larger.
Blitzcrank: Now slows.
Karthus: Now reveals up until the damage is dealt.
TF: Is now global again! Also, slows all enemies by a small amount until the reveal is over.
Varus: Spreads much faster. Unless you're on the outer edge of the spread, you're not likely to get away.
Vayne: Condemn now always has the stun effect during ult
Jarvan: All abilities (as well as Flash, if they have it) that the target can use to get out of the barrier are disabled until it's destroyed.
Akali: Now procs Mark of the Assassin