I have to say after the initial excitement, I'm a bit disappointed about how this is implemented. Apparently, there is no or little interaction between the Linux world and the Windows world in this system. I don't see the benefits over running a classical Linux-as-a-process like coLinux, or something like Cygwin or MinGW. The option to run unmodified executables is nice if you have closed-source linux binaries, but t…
Mapping the users is possible and "SFU" did this, with a couple of caveats (Windows requires group and user names to be different, while UNIX systems often have groups with the same name as users).
I don't think this is a Linux or GNOME killer, but it might put a dent in Cygwin and git-bash.