We releases a Toolkit Refresh (10618) on Monday to address some issues we missed with the 10606 build, as well a nasty regression that slipped through on the TabPanel.  We're working on beefing up our test coverage to add these cases so they don't get broken again.  Kirti has details here.

We also did a bunch more work tweaking the script combing features fo the ToolkitScriptManager, check out David's great writeup on this.