I was just thinking that since Alan Taylor is apparently directing the movie that maybe Carter Burwell will score. He was originally set for Thor: The Dark World before Marvel intervened, Taylor later said Burwell is his favorite living composer and still seems very frustrated with that decision.
That would be interesting if Carter Burwell would end up scoring the next Terminator movie.
However if Taylor brings Thor: Dark World composer Brian Tyler with him that too would also be interesting. Well the other day I was listening on Tyler`s AVP:R soundtrack and well if you listen to track 3 on that CD it sounded a little bit like it could have been written for a future Terminator movie.