It has been rumoured for quite some time now, and I think that the new server release is ready for beta-testing. Please jump in, and help finding the remaining bugs. If you find any, file them to the XHTML 1.1 Milestone, and owner to yours truly.
This is a significant update to the look and feel of MusicBrainz — many pages and workflows have changed and there are bound to be a number of bugs. We’ll need people to jump in help testing if we want to get this release out soon.
For right now, we’re not specifying a release date — we need to get more eyes looking at this new release before we can nail down a date. So, please jump in and help test!!