Well I can't imagine it being THE MCU Valkyrie but I wouldn't be surprised if they used a version based on her.
That being said MAN I can't wait for this book. Exiles was one of my biggest comic loves when I first started reading comics, read it all (yes even the Claremont era, alas). Can't wait.
Now I just hope someone finds out and jokes about Blink having kissed Annihilus way back when. :P (Back in the Blink mini that preceded Exiles)