I think EA want to release it as much as Bioware but it is MS who is holding them back due to possibly having part funded the development of the 1st game. It would be unfair on MS if they are one of the founders of the game (through funding) and then the game which made them ends up going to a rival console.
e.g. You spend thousands ona girl (buy her new clothes, perfume, plastic surgery etc) and then she goes and sleeps around :s
EA and Bioware obviously want to increase their userbase which is why they want to have it go to the PS3. MS want to keep it since they do not wish to lose an exclusive.
I think EA will probably to something similar to TECMO and release and ME1+ME2 or both ME's on their own but with added content etc and rename it ME Genesis or something. If they add enough extra content onto the game and change its name, maybe then they can justify releasing it onto another console without breaking any laws.