Anyone who KNOWS is not allowed to post information until after the official product announcement
Anything else is only speculation
Looks like CS6 is going to ship "soon" so everyone will know the new features
Encore has fewer new features per version. Also, because it is tied to Premiere Pro, you don't see the same ownership by employees.
New info re Encore is linked to the PR page. All I could see specifically is big news: Encore will now be 64 bit.