According to Kotaku, they received a confirmation from 2k that the game will be exclusive to 360 and PC. Three Speech has actually apologized for the post that started the rumor. However, there's always the possibility that it may be time exclusive.
It's going to be harder for ps3 to get these games to come over compared to 360 due to it being so much more difficult to make games for the ps3. Doesn't matter to me either way.