After reading this I hope that W9 won't be just a (big) update like 8.1 rather than an entirely new OS. Maybe I'm being a bit dramatic, but if they want people to forget W8 they should not only bring back a start menu but they should also change a big part of the visual style and perhaps the logo too. Maybe slightly rounded corners, a different appereance for the tiles, some revised aero effects. But above all a less colorful/childish OS.
Yes, to single or dual boot, but not VM. The whole idea is for MS to collect data for bug fixes, tweaking, and usage. Not sure if data is collected via VMs.
I would be very surprised if it doesn't show up on MSDN. When it does, ISO's will be available. MVP's like me should have easy access to ISO's. Hopefully they make them available to the general public too. It's a free preview so why not? If they do it though the Store like the free 8.1 update, that's just going to piss some people off. They will likely get less takers too. Anybody that had issues with the 8.0 to 8.1 Store Upgrade isn't going to be in a hurry to try it all again. It will be interesting to see how it's offered up. I want to do a clean install on my laptop so I want an ISO to make a bootable thumb drive.