"The device was first unveiled by Microsoft CEO Steve Ballmer at CES 2010 in January and was supposed to hit the market in mid 2010. But our source tells us that HP is not satisfied with Windows 7 as a tablet operating system and has terminated the project (something CrunchGear mentioned months ago).
HP may also be abandoning Intel-based hardware for its slate lineup simply because it’s too power hungry. That would also rule out Windows 7 as an operating system."