We are done with adding new features and we are currently polishing the controls and improving their stability. I believe that you will be pleased with the results because we will do our best to address all known issues for the official release of the WPF suite.
We have been debating whether to publish nightly builds and make them available to customers but we still have that ahead of us. If you have a particular bug that is blocking your work, please open a support ticket (or use a ticket you already opened), and we may be able to send you a fix.
the Telerik team