As you might have noticed, AngularJS 1.2.2 1.2.3 has been released lately, without dedicated announcement. Our update from an AngularJS 1.2-rc2 has been quite smooth, only two hints might be noteable in addition to the official migration guide.
With the current version the AngularJS team has fixed some issues regarding the isolate scope as described in the changelog for the 1.2.0 release or at the relevant GitHub issues #1924 and #2500.