So Mass Effect 2 was recently announced for the PS3 and from what I can make out its gonna include all the DLC that has been released so far and will be out January 2011. Trailer can be seen here http://arklaypost.wordpress.com/2010/08/17/gamescom-mass-effect-2-ps3-trailer/
Sad it doesn't have ME1 with it. Still I will probably snag this version if the port quality is up to snuff.
Hopefully it's a good port. Anyway, i'm still amazed at the Killzone3 MP trailer. Killzone2 MP is tons of fun and the new stuff seem to make it more epic than ever.
Seems a bit of a misstep only porting ME2 - it seems to me to be a continuation of the story. It'd be like starting a movie trilogy by releasing the series on one format, then only releasing the last 2 on the competing one. I suppose there's little that can be done - Microsoft own the publishing rights to the first Mass Effect, so there's not much Sony can do to change it.
Well I had a look in to that and it turns out they are planning on a sort of intro to the Mass Effect universe as Taucias said in the post above. I guess it will be sort of like what Sega did with Shenmue 2 on xbox. Also as stated all the DLC and apparently more will be included with the PS3 version.