For now, to use the Visual Studio 11 beta you have to load it on a non-production computer. Get your Free O/S from:
Really? Find out more, and of course you will need to download Windows 8 on a non-production computer.
To get started, see this video on the page at:
To find out about developer licenses, etc. read the page at:
Now what about C++ can you use it with XAML? Yes you can!
What if you want to use the great design tool Blend with C++, not quite yet, but you should still take a look at the way Blend functions.
What about Blend? What about XAML? Read:
XAML is still there, but it works pretty much the same way, so get used to HTML 5 in Blend: