They are Making Marathon 2 but only with 5% staff on that project at any one time. Destiny is in full swing so they are getting it so polished all they need is the Beta and Ship it after working out some bugs. No i do not think Bungie will have the time. They spent 4 years on the game well five and they plan on shipping. So i will say no unless they are willing to subcontract out to Obsidian or the like.