UR2 for Dynamics CRM 2013 has been released. You can download it from HERE.
The Build # for this release is: 06.00.0002.0046
Some of the notable improvements include, in no particular order:
Support for Windows 8.1
Support for IE11
Full support for Safari on iPads
Fixes for a few scripting errors
Of course, there’s a much longer list of fixes, and they are all described HERE.