These are developer devices - meant for compiling code. Therefore, they are high powered, chock full of every hardware feature that Win 8 will support, so that devs can play around with them, compile code and use them as their primary machine. This is a desktop replacement machine for development, not an iPad replacement.
Windows 8 isn't iOS, BB, Palm, or Android. What they're trying to show is that Windows 8 can be the OS on your desktop, your laptop, and your tablet. Microsoft has made it clear that they still consider tablets to be PCs, even if the primary input methods are different.
