Well, if the other DCAOM universes are just called the tittle of the film, we already had two earths in "Crisis on Two Earths", so why not;
Flashpoint Paradox - New Earth,
Flashpoint Universe (Flashpoint Paradox) - Flashpoint Universe,
DCnU (Flashpoint Paradox) - DCnU,
I only skimmed the first couple of posts but I think you may already of come the this conclusion, if so, sorry, if not then; oh well.
If the next movie is going to be in continuity with Flashpoint Paradox, like the Superman/Batman movies were, then we will need to come up with a name for the animated DCnU that isn't strictly a reference to flashpoint paradox, like DCAnU (Or something good).