IGN. The "IP bible" is consulted for all Mass Effect games, he explained, comparing it to an "iceberg that's down there, giving it weight and gravity, credibility and depth."
Echoing earlier statements made by BioWare co-founder Greg Zeschuk, Muzyka pointed to the franchise's considerable backstory as a viable source for "future extensions, ancillary products, things like that." Things like that may include spin-offs like Mass Effect: Galaxy for iPhone, novels, further expansions to Mass Effect 2, and, obviously, Mass Effect 3.
Sadly, if there's one thing the Mass Effect bible can't teach us, it's the virtue of patience. Who wouldn't kill for the next part of the trilogy right now?