Well, you can see the milestone page for Mixxx 1.10.0 here to see the bugs and "blueprints" we're working on: https://launchpad.net/mixxx/+milestone/1.10.0
A lot of the features are in rapid development right now -- our "feature freeze" is April 8th, so we'll have a better idea of what made the cut by then. As per our developer meeting last month, we set forth this tentative roadmap for 1.10.0: http://mixxx.org/wiki/doku.php/developm ... section110
Stuff on that list may or may not be done in time for the freeze -- after the freeze the team only works on fixing bugs so that we don't introduce new bugs as we lead up to the scheduled release on May 8th.
Once our progress is more clear, we'll get a blog post out