I think quite literally every champion got a base stat increase. For tanks like Alistar for example, their base armor has doubled from 24 to 44. Also this is quite a gigantic change tailored for SUMMONERS RIFT, which is the game mode that's meant to be played (as in, ranked, LCS, blablabla). They'll edit in tweaks specifically for ARAM I guess, but it's never going to get prioritized over SR.