Rumor has it that John Paesano (Maze Runner) will be doing the score.
Why Rumor? It was on IMDB for some time, then it was deleted, then it was put back on and now it's deleted again.
So maybe the guy is involved, maybe not, since anybody can edit IMDB, but there is a chance he might be ending up doing the score.
I don't think Alan Silvestri will come back, it would be nice, but the truth is he is not needed, the score (besides the first AvP) was never a Problem in these movies. I liked the score for Predators, the new/mixed parts at least and i think any good composer can deliver a great music for this movie.