Take a look at My Windows 10 Preview video.
I installed Windows 10 in VirtualBox since it's still in beta and may have problems. Video covers main features introduced in Windows 10.
You can download Windows 10 Preview here.
Supported platforms are: IA-32, x64, ARMv7.
You need to join Windows Insider program in order to get Windows 10 ISO.
Here's Windows 10 announcement blog.
