The E change to Akali is horrendous. The range nerf hurt big time as well. I think Riot should either revert the E change or rework E and see how she fares. I would even restore her ULT range, but that might cause too much flaming on the boards.
Honestly, for an assassin, Akali seemed fairly well balanced. She dominated solo-q, which gave her a bad reputation, but she has tons counter play and quite a few counter picks. Now, I am an Akali main, so I might be biased.
Fizz can be more dangerous now (at least according to a Fizz main I played with the other day; he seemed quite satisfied with his performance) if he lands that ULT, and survivable if he doesn't have it and you play well. That being said, some number tweaking to make his performance spread a bit better across skill levels wouldn't hurt. I have never played him so I don't know his kit very well.
I haven't tried the new Ahri yet (I used to play her a ton but have been busy trying to undo certain habits I have on Akali that rely on E proc'ing Q, mostly related to CS-ing and chasing down runners) but the changes look interesting. The fact her win rate has spiked so much makes me think they might have over tuned her though.