I agree, I don’t want just some random new flavour of the month character but it would be nice to see someone we haven’t seen adapted yet
Out of the b-tier essential X-Men members, Polaris (in film) and Forge are the only ones we haven't seen in the big screen. Though Angel, Gambit, Psylocke, Dazzler, Emma, Havok, Banshee and Jubilee haven't joined the X-Men team in any of the films.
I'd like to see Sage as the tech/security member alongside Forge and Cecilia Reyes as the med member of the team alongside Beast. Sage/Cecilia would get smaller roles and they wouldn't be part of the main roster for at least for a couple of films, since I want the MCU to focus on the more essential members.
The villains would compose of more newer faces, I guess. We haven't seen Mr. Sinister, the Nasty Boys, the Marauders, the Acolytes, Bastion, Avalanche, Mojo, Spiral, Sauron, Destiny, Omega Red, Abyss, Ozymandias and eXodus. I wonder if we are going to get a MCU version of Lady Deathstrike, Callisto and Selene. I hope looks wise and costume wise, they would be closer to the comics and that they wouldn't be just henchwomen.