Note it will never happen.
Bioshock comes to PS3 more than 12 months after the 360/PC version. PS3 Bioshock will sell under one million copies - I guess around 800k. 360 Bioshock has sold 2 million copies.
MGS 4 on PS3 in June. This game would be great on the 360 and would sell a lot of copies. 4 disc boxed set of MGS 4 would cost a lot less than one MGS 4 Blu-Ray game disc. Ports of MGS 4 to 360 would cost little compared to developing MGS 4 on the PS3. Please port MGS 4- Konami.
XBox 360 sells more games than PS3- proven fact. Attach rates: 7 games per 360 console sold. PS3 only 3.6 games per PS3 sold. GTA IV sales of 360 raped PS3 sales of GTA IV. 25 % more sold on 360.
^We will just have to wait and see what happens in 2009.
We want Gears of War and Mass Effect trilogies on PS3. Should cut them a deal offer them something.