Perhaps you have seen this before, but I didn't find it.
I saw this GDC PS3 Gameplay Montage and at about 2:40 there is a short clib from something looking like a Linux Desktop with a video playing. It is subbed with "You're looking at the key to winning the console war."
Anyone heard about it?
Here is a shot I made.
They had a linux kit on PS2, so there is a chance. But I doubt they are opening the whole Cell Chip to Linux, perhaps only the PPC core or the core and just some SPUs, as It would make a great and cheap number crunsher.