Seems like a strange marketing move, why would they go to Linux before OSX? OSX is far more popular than Linux. And since when does the PS3 have DirectX support, I thought it was OpenGL only?

That's nice though, if games start coming out for Linux maybe some people will start moving to it. Microsoft will loose some of it's market and be forced to actually make some usable products instead of telling customers that they don't have a choice.