Being under NDA, we can't say too much.
I had some success with DP 6 during the beta.
But, i discontinued testing 1.4.1 because I thought it was causing some other prioblems (sealing violations).
This turned out to be a problem with some modules I had placed in /Library/Java/Extensions to get web services working on the port.
I never had the time to go back and try DP8.
I may do this now, though.