According to a story from The Times, Bobby Kotick- Activisions CEO said "We might have to stop supporting Sony."
Kotick “I'm getting concerned about Sony; the PlayStation 3 is losing a bit of momentum and they don't make it easy for me to support the platform. It's expensive to develop for the console, and the Wii and the Xbox are just selling better. Games generate a better return on invested capital on the Xbox than on the PlayStation,” he says.