First off, they said portable market, which basicly excludes phone-centric OS:s like Symbian, WebOS and last, but not least, WinMo. To be honest the GPU difference is way too large on the different Android devices currently availible to produce graphics that can rival or match the Iphone's. Which platforms are left!? Pandora? I won't even consider Blackberry in the entertainment section...

Edit: Of course the chances are slim, but there's no reason to lose the hope.