No such team or downloads that you can just get into that I know of. Will be awhile until people can get their hands on any real usable Win 8 builds, beta or otherwise. Only ones that have any pre builds as of now are trusted partners, and it's not just something you can slip into. Unless some level of build leaks into public, but as far as I know, that hasn't happened yet.
For Windows 7 they had both. The public Beta is available to anyone who wants to test it. Win 7 had a app. for sending feedback. MS had what was called official beta testers that was by invite only. And I do believe that they will do the same with 8Hi,
Just a quick question on this, since I don't really know how it works:
When Windows 8 eventually enters an official Beta, how does Microsoft decide who gets to test this Beta? Is it really only IT developers that get to test it, or does the Beta also make it into the public domain to be tested by Joe Public?
I think it would be quite interesting, having never tested an OS before it would be a new and exciting experience, unfortunately, it seems like a lot of time is required? right now it is the one thing i don't have. Still by the time a beta is released things may have changed.