Will I be using Windows 8? Sure, at least I give it a try when I get a licence to test it. There are too many technical improvements under the hood to be ignored
There's a free 90 day trial of the Enterprise edition here. You don't need an MSDN subscription to try it.
I know, but it will be just extra work to test something. I'm quite sure W8 is good enough to be used as dev environment.