Actually no, the OS is designed for all platforms (as mentioned in the M$ video). You can switch modes. See post #3
Windows 8 Consumer Preview works great on the same hardware that powers Windows 7

The Windows 8 Consumer Preview is designed to be used on all PC types for all consumers to try and then give feedback.

Requirements:
Processor: 1 gigahertz (GHz) or faster

RAM: 1 gigabyte (GB) (32-bit) or 2 GB (64-bit)

Hard disk space: 16 GB (32-bit) or 20 GB (64-bit)

Graphics card: Microsoft DirectX 9 graphics device or higher

To use touch, you need a tablet or monitor that supports multitouch