The reason it was an "older build" was for "certification and testing reasons," says Chris Priestly. It's "noticeably better at launch" promises the studio.
"The demo was, for certification and testing reasons, about a 2 month older build than the final “what you will play when you get it home” version. I think you’ll see that the game is noticeably better at launch," BioWare's community man Chris Priestly.
Mass Effect 2 releases on PS3 January 18th in the US, which is tomorrow. It uses anto cover the events of the first title and has choices to be made. Later this year Mass Effect 3 releases for Xbox 360, PS3 and PC.