Prequels always worry me, mostly for continuity's sake. Can't remember any specific examples but I know it's happened before, where a prequel either has the same character who then mysteriously loses all his powers and abilities before the original games, or the technology in the prequel is improved over those in the original game despite it being set before hand. I don't remember bungee tentacles in Deus Ex or IW, after all, but I've got enough faith left that I'm sure they'll cover their bases somehow.