I got also some Customer Feedback which match our current internal testing results.
As Ben mentioned 10.3.1 will provide official support for 10.8.3
But what we could test here (this had nothing to do with the internal official QA Tests)
- MBP Retina 15"
- MBP Late 2012 15"
- MBP Mid 2009 15"
- MBP Late 2011 13"
They all got updated from 10.8.2 to 10.8.3 with WDE turned on an running 10.3.0 MP1 and are experiencing no Issues so far.