Old news. IIRC, this was used against Vista before, and it needed administrator privilidges.
You had to jump through like 10 UAC prompts before it let you do it.
Yeah, but this is besides the infection vector. There are plenty of viruses/rootkits around that hide themselves in different and creative ways, like the article lists at the top. This is yet another way to hide an infection on a system.
And yeah, although this rootkit is specifically for Vista, it's a new and unique concept. The idea of secretly running an OS within a virtual environment is interesting and scary.