I have an HP Touchpad running ICS and hardly use it. I use my Gnexus most of the time. But, I have been looking at more "robust" tablets with pen capability. The Modbook Pro looks neat. http://www.modbook.com/modbookpro
I think it would be hard to fit a powerful GPU or a big battery in the screen alone. Some extra storage in the keyboard wouldn't hurt either.
Nice to see the hardware manufacturers joining microsofts new paradigm of tablet/laptop combo in windows 8. I bet those who complained about a combo OS before are quieter now.
At least the HP model prefers to use the keyboard battery when connected in order to preserve the one on the tablet side.
The problem with having too much smarts on a detachable piece is that you start running into interesting engineering problems when dealing with sudden disconnects. What do you do if your data disk suddenly becomes unavailable?
I remember being able to add and remove CPUs and memory on Sun machines running Solaris, and I remember reading about Linux having something like that for CPUs and memory - although you should tell the system you are about to unplug something so that data and processes can be moved somewhere safe. IIRC, you can just yank out a CPU module from a live IBM mainframe with not that many ill effects too, the price you paid for the ability excepted.
At least in theory, you could have a very low power processor on the tablet side and some extra memory, a faster processor and extra storage on the keyboard side, but, again, this would be an interesting problem for less careful users. Unless you design a lock mechanism where you press a soft undock button and, when the OS considers it safe to undock, it would release the locks that keep the mobile portion docked.
In any case, transparent hardware removal is something one would expect on serious server iron, not a laptop running Windows.
Should be interesting to see how the likes of asus can compete in the long run (I am guessing price and slightly garish features will most likely differentiate); having an actual product on the shelves surely gives you a head-start.