Fiora's identity has not changed significantly.

So I was able to get my hands on the new Fiora. I was able to play as her, and against her in lane. I can say with some certainty that although a couple elements have changed the lane phase for her (previous counters are countered by her, other champions that she used to counter can now outplay her etc) Her late game identity is still the same.

In that she's still not a fighter, she's an assassin. After getting used to her, she has proved that she is the grand duelist. She can one v one anyone. And provided you finish off your first target before another one arrives, you can one v one them too.

However, her team fighting potential isn't any better than it used to be. Sure, there may be an opportunity where you can pop off that AOE heal in the middle of the fight, but keep in mind, it's not a Janna ult. It's not instantaneous, and chances are you're going to use it on the enemy carry, in which, if you and your team are able to destroy the enemy carry, chances are you've won the team fight anyway.

If Fiora is in the frontline she will get melted. She's not an Irrelia or a Jax. She's a master Yi if anything. And she was before the rework too. Now she just traded some invulnerability for sustain, so you can't just R into the carry and hope you kill them. And I like that.

But Riot trying to pass off an obvious nerf for the sake of counter play, as an entire identity change is absolute horse radish. She's an assassin, and always will be one.