I wasn't crazy about Glacchino's Star Trek score. I just watched it again recently and was pretty underwhelmed, especially since I had just watched Star Trek 1, 2, & 3, and have always loved Goldsmith and Horner's scores.
But I really am not familiar enough with Glacchino's work to honestly debate his abilities to score Ep VII.
That being said, I will be surprised if JW is not the composer.