This game is a little more complicated than what it appears to be on the surface. Activision are the largest 3rd party publisher in existance right now. They have games which hold a lot of sway with consumers -> Diablo, Call of Duty/Modern Warfare and Guitar Hero are the main ones. They also hold a lot of sway with other publishers as well, when they jump one way they will definately send ripples amongst the others. Since we don't know precisely whats going on behind the scenes to motivate them to make such statements its hard to determine exactly what they want to happen behind the scenes. Its further complicated because we don't exactly know what conversations they are having with Nintendo and Microsoft regarding their games as well.
Long term, I would say perhaps they may consider themselves better off with a two horse race than a three horse race, especially if the other console manufacturers make it worth the trouble. This is considering that perhaps Sony is unwilling to cut the price significantly enough for their liking and because of that they feel that the future profitability from the PS3 platform is being hurt so they would wish to act now and aquire a positition which is in their own best interest with platforms which are selling much better in their key western markets.
Tease.
