Hot off the, ummm, presses(?), we've just posted the first beta release of version 7.0.
As you can tell from the major version number bump, there are some large changes in this one, including a lot of significant user interface improvements. The beta page gives you a taste of those.
You'll also see that some major changes were done with regards to custom themes. We'll have more to say about that between now and when 7.0 gets officially released, but if you have your own custom themes, you may want to give it a quick spin to see if you'll need to make any changes to your theme.
We're very much looking forward to hearing what you think about this new release!