As many of you are already aware of, Reach was Bungie's final Halo game. Ending their partnership with Microsoft and joining EA for a large new project, only theories exist as to what might Bungie/EA could develop. This is one of those theories.
First and foremost: IT WILL NOT BE CONNECTED TO HALO IN ANY CONCEIVABLE MANNER. Microsoft possesses the rights to the franchise. An anonymous source recently stated that (quote from website) "...Bungie's upcoming title will be what we would refer to as a Sci-Fi MMOFPS. It will practically be WoW in space, for all intents and purposes."
So, an MMOFPS, eh? This is where my theory begins.
1. A completely new universe and lore
2. Borderlands - style gameplay
3. Ability to command ships and enter dogfights while in space
4. Some sort of dungeon system
5. Bungie being Bungie will likely insert some easter egg referencing Halo
6. SWTOR-style dialogue
7. A war with: Other humans, Aliens, Infected Humans, Creatures, Robots, or some other entity
Well, that's it. If you would like to contribute to this theory, simply post a response.