Solo XP kill buffed, share XP nerfed. Which means:
Assassins like Fizz, Zed, Katarina that can solo kill opponent gets buffed, meanwhile "sinner" champions that are going to push and roam to help team (pyke, pantheon) gets a slight nerf. resulting in them dropping a tier.
Orianna buff and Tristana buff is quite big, impacting their tiers a lot.
Ryze gets a nice buff, but with Orianna being buffed, Syndra being a strong pick and cassio aswell ryze has a lot of hard matchups and is rarely a good pick.
Certain mages like Anivia gets buffed a little bit by share XP going down.
TLDR of this patch: Dont die Solo, pick a mage and gg :)