Since Larian is self publishing the games, I would think they would probably aim for a relatively simultaneous release. Different localizations may take longer, or there could be problems with the distributors in some regions, but it should be much better than Divinity 2 (where none of the North American publishers wanted to release the Xbox version of DKS until they got sales results from Europe, and the US didn't get a PC release).
GameBanshee has the Xbox 360 and Playstation 3 listed for Dragon Commander, though I have not seen any official conformation of console versions yet. Presumably Project E will be coming to the same consoles as Dragon Commander.
