We've just released the 3.11 build of Dotnetnuke, which will be the final beta release for DNN 3.0. At the moment, the builds stable, with only a few bugs left, currently none with show-stopper status. We received an updated version of the microsoft memberrole.dll (& scripts) yesterday from Microsoft, and once thats been integrated and tested we'll release the RC. As the updated memberrole contained a number of breaking changes from this will stll take a week or two, but happily Microsoft updated the EULA, to allow this to go live on production systems (expect Telligent to do also quickly turn around a new communityserver release with this integrated).
This beta cycle has been significantly longer than we anticipated due to this and other factors, but happily we've also managed to add a significant number of items that were on the roadmap for later versions, so hopefully the wait has been worth it.