Yup exactly as I predicted. A dual boot system that docks and is a standard AIO PC or a tablet undocked runs both windows and android.
http://www.engadget.com/photos/asus-transformer-aio-hands-on/#5063459
windows pc to clarify
Who knows, but here's another theory. We usually refer to computers as all in ones(e.g. all in one desktop). Maybe It's not a tablet but a combination of an android tablet and windows pc. Kinda like you use android while on the go and connect it to something to make it a pc.
i gotta agree with you about a dual boot system. i do think the drops forming into one then splitting to windows logo and android is a huge hint at either a dual boot tablet or android on windows. if you remember there was a company at one point trying to make it so you can run android through windows.