Regarding Sony's next platform, someone at B3D had this to say:
http://forum.beyond3d.com/showpost.php?p=1615081&postcount=53
I have no idea how reliable the poster is, though he seems to know what he's talking about in other posts. I even commented on how I hope it's at least faster than the 720's specs and he said my hopes were too high =/
The problem with Move is that there is no easy way to determine the actual install base. Yeah sales can be good but when each wand is considered a sale, it greatly effects the important stats.
Sony said they want to launch alongside the other systems. It's highly likely the ps4 will launch the same time as the Xbox.