For example: a (para)-VM that's capable of running off Linux filesystem or subvolume (so you don't need to allocate separate partition or disk image for that), capable of running all the win32 binaries, and seamlessly integrating into Linux desktop and infrastructure (i.e. non AD-Kerberos would be great).

I was originally going to say that they should open source those. But then I changed my mind to just releasing it on multiple platforms as a start. And so Windows doesn't make sense there. I should have proof read that better. Thanks for pointing it out.