I thought the Fiora update was going to be minor..
Her old kit is gone. Which is to bad because I liked the old one. The new one looks okay too, but it's a new champion now.
I liked that the old Fiora had to commit to a fight. Her old Q was targeted so using it meant she was going in to fight. Now it's just a dash. Doesn't seem very duelist-y to me.
And I never thought the old Fiora was OP, especially after they nerfed her ult. She was a bit feast or famine, but that's not a bad thing on some champions.