The Fiora buffs on the PBE were a kneejerk reaction, and are unneccessary
I've been playing Fiora almost exclusively since she was reworked, and I'll admit, AT FIRST, I would have agreed with these buffs. I felt she had low damage, and didn't really do much of anything. At one point I swore to my friend she was useless and Riot ruined another one of the champs I liked. I almost gave up on playing her. However, I didn't, and I'm glad that I didn't. After around the 7th or 8th game, something clicked and I finally figured out how to play her and her role in teamfights, etc.
I know this is anecdotal, but the turning point for me was in a game where I managed to lose lane to a Nasus with no help from his jungle(yes, I was that bad) but we got to late game and I could EASILY 1v1 him which caused us to win every teamfight because of Fiora's insane ability to kill tanks, and pretty much everything else. The very next game I was 1v1ing a full build devourer yi late game =/.
Anyways, my point is, personally I think that Fiora's actually really over tuned at the moment and she just had low win rates on her first few days because people were basically playing with a new champ. I just checked her win rates and she's actually back over 50% for both ranked and normals which seems to support my thoughts. So, maybe cancel those Fiora buffs?
Edit: Seems that I'm an idiot and the buffs were patched in already. Guess that's why she suddenly didn't suck anymore!