Since Platinum Dunes is co-producing this with Paramount, it's very likely we won't get Harry Manfredini back unless whoever directs it has a clause that lets him score it. (Like Sam Mendes' contract allowed him to use Thomas Newman to score Skyfall rather than David Arnold.)
We'll probably get another lackluster 'score' by Steve Jablonsky. That was the most disappointing thing about the remake. I doubt reusing Manfredini's themes will be on the agenda for the sequel either.