BioWare's Chris Priestly has made an attempt to put all of the rumors and speculation to rest:
Mass Effect 2 is not coming to the PlayStation 3. On the official
BioWare forums, Chris points out to fans that "the Unreal Engine is cross platform, hence the PS3 code", which is the same point that was used for the code located in the PC version of the original game. I can fully understand getting your hopes up as Mass Effect is a great series, but it just isn't going to happen. I am beginning to think that we, as gamers, really speculate and draw our own conclusions too much; there were numerous sites and outlets who posted headlines yesterday that the PS3 version was pretty much confirmed. Sorry folks, nothing to see here... move on...