Ninja Theory, the development studio behind Heavenly Sword, has announced that the 2nd game will be on the 360 as well as the PS3. Explaining about particular limitations as a small independent game dev studio they describe:
Yes, our new game is going to be PS3 and Xbox 360. We have actually signed it but we are not announcing to who at the moment. -Kristensen, Game Producer At Ninja Theory
How the 360 fans will follow the 1st is unknown, but we expect a sharp recap.