Mass Effect 3: Bioware Explains Galaxy at War!

[SvennoJ]

"success in multiplayer will have a direct impact on the outcome of the single player campaign,"

BioWare reiterates that participation in any of these extra modes is optional. "You can reach the highest levels of success in the single player experience alone, but Galaxy at War gives you alternative ways to get there." So, if half your crew died during the final stand in Mass Effect 2, you might want to bolster your odds a bit with some co-op gameplay.

I hope that doesn't mean more planet mining if you don't want to play multiplayer.

I'll probably pick it up pre-owned, it should drop fast in price with the online pass nonsense. If they're smart they'll release a single player only version alongside for 10 bucks less, I'm not the only one thinking this way.