The PlayStation 3 uses the much hyped Cell processor but that processor could be dying a quick death. IBM was one of the partners that developed the CPU but they are pulling out. Also, the VIP has stated
that the next iteration of the Cell is now canceled.
With that news, that begs the question as which CPU the PlayStation 4 would go with. Now, it's probably going to be a while anyways before a PS4 would be released but you would think R&D and some design work as been long in the works now for the next console and this would through a kink in the plans.