3) its definitely a place holder, which is really annoying to be frank. Even though people are waiting for WinMo7, for an enterprise user (like myself), MS is telling us to wait until WinMo 8 (yes, 8!) before we can have the secure enterprise experience that RIM is already offering. (and while I've used BBs in the past, I'm waiting for WinMo to get its act together so I can get a TouchPro2 or whatever version they're on before my work allows them onto the network)
As a filler, its to not lose too much marketshare to Android, and also to show that MS hasnt completely given up on the platform. (and until it now, it seems like it practically did)