That's probably because its only a prototype and not a released version.
If you're playing games you probably have the most selection on the iPhone. Unless you like to play Japanese games, e.g. anime laced games like RPGs, tactical RPGs, eroge, fight games, like the kind of games that laces the Sony PSP in Japan. The deep Otaku material isn't going to get past the Apple censors. If that is your gig, the PSP Phone aka Xperia Play has a lot of promise. Its not there yet, but this phone is sowing the fertile ground for it, along with the exploding popularity of Androids in Japan.
Plus you do get an Android smartphone and all the Android applications available. The Android game selection is growing nicely on their own, but then again, you can find such on other Android phones. You need to look for what makes an Xperia Play unique from other Androids and that maybe if Sony puts the Playstation Network on it, which also means lots of media like music and movies. And sooner or later, games that are unique to the Xperia Play and the Playstation Network.
If you're looking for an Android phone to do rooting and flashing and all that stuff, there are probably better phones for that.