Thanks. With Feats, when do we get to choose them? Level 4? Also level 8? Is it the same for all classes?
With the big caveat that I am only a BG3 EA player, not 5e PnP, and one that rarely has a fighter in her party, I think within EA we only get to
choose a feat at level 4 at the moment, along with other classes. But fighters also get other abilities at other levels, such as Action Surge at level 2 (which gives an ability to get one extra attack per ... short rest, maybe?) and the aforementioned Extra Attack at level 5. Plus, at level 3 a fighter gets to decide whether to be a Battlemaster and get yet more different sorts of attack, or Eldritch Knight and start learning some magic as well. I don't know, but I suspect that if you want to be a magic-wielding fighter then the latter would be a better option than a sorceror with a sword, though unless the fighter puts points into INT they have to pick the spells they're going to be using carefully, and will end up a worse fighter than a Battlemaster and worse magic user than a Sorceror, but of course with more flexibility so that's the trade off!
Beyond level 5 I can't comment. There's stuff about 5e feats at
https://www.dndbeyond.com/classes/fighter but how Larian will implement this I don't know.
And it's been said before, but I'll say it again, BG3 really needs some kind of representation of how the class will develop over time so you can see what your options are going to be and make choices now that help you create the character you want. I found the sheer variety of class choices in Pathfinder Kingmaker utterly bewildering, but it had what I thought was a really good representation of what abilities each would give when that was extremely helpful!