The next service pack (SP1) of our Q2 2012 release is scheduled for the end of July. The next major release itself (Q3 2012) will be available around the middle of October.
Hope this is an acceptable time frame for you.
On a side note, the hotfixes (internal builds) are not recommended to be used in production environment - these internal builds are not fully tested so you may experience some additional issues.
the Telerik team
If you want to get updates on new releases, tips and tricks and sneak peeks at our product labs directly from the developers working on the RadControls for ASP.NET AJAX, subscribe to their blog feed