Maybe it is the game being good, maybe it is just nostalgia,

http://en.wikipedia.org/wiki/List_of_best-selling_video_game...

With 240 million sales, there's probably a little Mario in each of us. New releases and/or perpetual emulation of Mario games is the one constant we can expect to find in future generations of devices with new and old generations of people alike grabbing coins and jumping on Koopa shells.

Yes, though the new Super Mario Bros. Wii is surprisingly good, and not just a copy of Super Mario World.

We can already use C++ to develop games for Android.

http://developer.android.com/sdk/ndk/index.html

Only if Sony doesn't do a thing to lock the software up. Maybe they could add SPUs to the phone, or something that would lock the software to the platform.

I'd be surprised if they don't have custom graphics hardware, of some sort, in there - I imagine the last thing Sony wants is to commoditise themselves by providing the same hardware platform as normal Android phones.

Even if they don't have custom hardware, I'd be shocked if they didn't have some sort of silicon DRM to stop the software running elsewhere.

iPhone / iOS.