Nobody even knows what the phone will look like, yet. Everything so far has been artists' impressions and maybe-possibly-perhaps rumours.
Besides, there's absolutely no reason the phone couldn't come with a Dalvik stack for Android, and a little included app called "Playstation". Maybe even a hypervisor to rapidly switch between Playstation mode and Android toyphone mode? They can do that, you know.
Personally I'd rather the whole thing be a bit more integrated. An Android toyphone with a really beefy GPU and a Sony games market in addition to Google's stuff, perhaps.
Finally if Sony call them Playstation games, they are Playstation games, Android or not. They own the brand, yaknow?