At the Mobile World Congress in Barcelona today, Sony Ericsson officially unveiled Xperia PLAY, the first "PlayStation Phone." Xperia PLAY is a 4" touchscreen slider, but instead of sliding to reveal a keyboard like most slider phones, it reveals PlayStation-style controls and buttons like Sony Computer Entertainment's PSP Go. It's powered by Qualcomm's 1 GHz Snapdragon processor with the embedded Adreno GPU capable of 60fps playback 3D gaming. It also features 400MB RAM, support for up to 32GB MicroSD storage, a 5.1 megapixel flash camera, aGPS, Bluetooth 2.0, and 802.11 Wi-Fi with hotspot functionality. Thanks to a patent application Sony Ericsson filed back in 2006 for a video game phone, rumors of a PlayStation phone have been persistent and long-running. But Sony Ericsson in January revealed that it wouldn't just be releasing a single phone, but a whole gaming platform that lets other Android smartphones become "PlaySt...