jiggle said:new(?) interview with Hirai on this initiative
http://www.andriasang.com/e/blog/2011/01/29/hirai_on_pss/
As Sony hopes to make use of the millions of Android compatible sets throughout the world, they're not doing such things as selecting partners and the like. "We have a completely open stance," said Hirai. "With carriers and with hand set makers."
Sony's openness with PSS appears to extend even beyond Android. "There are a variety of OSes," said Hirai. "But we're focusing first on Android. There's also Windows, iOS and so forth, but we don't have the resources to make it compatible with everything from the start."
I find it very unlikely, not only because on iOS it would be clashing with Apple's own Game Center, and when it comes to Windows, I see Microsoft expanding upong Live Anywhere. It just isn't smart at all to go to them.
Android is different. Not only is there a demand for it, but a need for such a service. That combined with the insane growth of the Android market is what makes the investment worth it, the other markets? not so much.