I'd love to see a detactable touchscreen product where tablet part is a standalone device, but the keyboard part contains additional battery and hard-drive and

I'd love to see a detactable touchscreen product where tablet part is a standalone device, but the keyboard part contains additional battery and hard-drive and maybe even additional memory, GPU and CPU. That way the low powered tablet screen could be taken off when I want to only read or watch video, but the full power of the device is available when it's docked, with tablet or desktop interface available for each mode. (Yeah, I get that plug-and-play chips & memory are unlikely to happen, so perhaps the keyboard part would contain a separate host OS and they'd communicate over a more hot-swappable interface...)