It's nice to see that they stuck with the POWER instruction set instead of Sony and Sega jumping to x86, as rumored. That would've been spectacularly stupid.
Other than that I'm thinking it'll be between Sony and Nintendo again, since Sega's pretty much the sick man of the industry, even if they're getting a lot of support from their parent company (Remember when the rumor was that Microsoft would just release their own console, instead of buying someone out?)
Apple is just positioning the iPlay as a living room Mac and Airplay device and everyone knows it. I mean it is just a really just a current-gen Mac Mini with a BD drive and somewhat beefier specs running a modified version of OSX, from what developers have said. The controller looks damn comfortable though.
Admittedly both Halo V and Mercenaries 2 (finally!) looked amazing on it, so I'll probably get one.