I must commend Microsoft for removing all barriers of entry to the Windows 8 Developer Preview - no signup, no msdn subscription required and best of all, no download manager activex control.
I actually like the official answer: "We've seen it work, it should work, but it's not supported." Much better than "we can't comment, we don't support that."
edit: They seem to be collecting "pro tips" from users, so you are welcome to try any scenario and tell them about it, so they can tell other users.
Got it up and running on a hyper-v VM in about 30minutes. Running great, but I can't figure out what the 'back' button equivalent is on the keyboard so that I can exit the App I'm in :)
edit: Turns out it's the windows key! I couldn't use it from the hyper-vm client, but once I remoted in via Remote Desktop it worked great. Loving the apps so far.
As am I. I have an old extra C2D machine here currently running Ubuntu that I plan to reformat to Windows 8 (My laptop is my primary Linux machine these days). I'm looking forward to playing with the new dev tools.