It is a grey-area marketing at its commercialiest (new-word-a-day), I bought a PlayBook few months ago, precisely for this point, yeah Gingerbread layer was there, but I was also suckered into buying an utter trash. For two reasons that they don't tell you about:
1. it is API layer, akin to Windows NT being POSIX compatible; I was thinking more of the relatively excellent IBM OS/2 running Windows 3.1 flawlessly either within OS/2 or desktop so this is total let down. Having no side-loading it is limited to the sorry-state BlackBerry World with quite limited selection of quality free apps of either BlackBerry natives or Android on layers.
2. some functionality is not exposed as Android API, such as Bluetooth, I think I saw accelerometer being on RIM's blacklist for original PlayBook OS but cleared on BB10.
They lost a customer here, don't trust RIM anymore.