I also forgot to mention the Horseshoe-Face Omnic from Sombra's web that connects to Reinhardt somehow, pretty sure he might be a potential character too.
Doomfist seems to be a given, as that character plays heavily into the games current narrative. Especially with regards to Orisa & Talon.
Yeah, that's why I expect Doomfist to happen at some point, even if not particularly soon.
I didn't think about a future hero coming from Iraq, but given the Oasis map, you've brought up a good point about a playable character coming from that region. Should be interesting what the development team will come up with, especially with bucking trends with some of the archtypes.
The only reason why I think a character from Iraq is very likely is because of Oasis yes. It seems like Blizzard kind of wants to have maps that connect to characters. The last few characters all had "home maps" (and in the case of Sombra and Orisa, are the first characters to have those locations as home maps).
Which is also why I think we'll be getting a second Chinese character (probably Liao) to tie into Lijiang, because Mei's "home map" is Ecopoint Antarctica, while Lijiang doesn't outright "belong" to her.
As for Brigit, I'm expecting her to stay in the comics and not being making a playable appearance. (Though, like with Efi for Orisa, I would love if she made an appearance in a highlight intro for Reinhardt.)
I dunno, Blizzard has pretty militantly shown her in most of the comics lately, and she also shows up in several sprays. Out of all the background characters, Brigit is the most prominent one. She has more presence in the lore side of the universe than even actually playable characters like Symmetra, D.Va or Zarya have currently. She even appears on Sombra's web!