My one worry for this game is that there won't be a set protagonist and we'll be playing as something like Spartan III's and IV's -- dime-a-dozen soldiers with no personality or characteristics that define them as special. I think you could come up with the most creative and engaging world, but if you don't have that face to put on it, you don't really have a franchise.
How long has it been since Jason Jones put his name on a project, anyway? Since Halo 2?