Fiora's new kit is very unbalanced.
I just played a couple custom 1v1's with my friend since he wanted to try out fiora. I realize now just how over powered she is. Her dashes and jukes are fine, the parry could use a bit of work, I'll get into it, and her new ult brings a new level of skill to her rather than the old "Ult and pray." But in the hands of anyone competent she's way too strong.
To start with, her parry. I'm fine with the blocking of damage from autos, but she blocks all damage from all sources except spawn tower. She basically has Kayle's ult for a second, as her w. If it were to only dodge auto attack damage I feel like that would be more in-line with the other champs who have damage negating moves.
Second, her true damage. It's really high. When I say really high, I mean she did 1600 true damage to me when I played a tanky hecarim against her. That was with just 2 auto attacks. I had near 250 armor and over 4000 health. But with 2 autos I was nearly dead as her base damage is ridiculously high anyway. I'm not even going to say anything about her true damage poke anytime she wants because of the vulnerable markers.
Thirdly, right now the damage she does from true damage seems to be critically striking with her e -___-
Whether you're playing as a tank, a mage, an assassin, a fighter, or a marksman Fiora has you beat. Her burst of true damage will beat any tank or fighter. Since she's an assassin she'll naturally be strong against marksman's and Mage's. The only way to have any hope of beating her is as an assassin yourself, where her parry will block most of the damage anyway.