Wow, the UX or User Interface has changed quite a bit, to determine how much it has changed see:
This is exciting for system architects, finally a redefinition of the old WOSA (Windows Operating System Architecture) which has aged, aged well, but needed to be updated and energy applied to the whole environment.
To get Windows 8, get your no cost trial version of the consumer review:
Make sure to load it on a machine that you aren’t placing Win 8 on a production machine, although the beta is very stable, still it is a bad idea.
Also, it appears that the Windows Phone Emulator isn’t working in the Win 8 64 bit version.
Have fun. Keep it simple. Keep it clean.