After watching the vid and semi sorta figuring out what all that techno jibber is the free update to just the older Eb5 package is really quite a bit (if I'm understanding correctly).
Essentially we get the extra "slide" articulations, string plucking that can be changed while playing (pick/thumb/finger whereas before I think we had to choose either fingered or picked and stick with it) and the effects (octave, 10string, chorus, etc...). It loads in Rap Session instead of DP... but I wonder if it will still load in DP or the old Rapture (and retain functionality... probably not).
I have not tried RapSession yet so this would be my excuse.
The only things missing I guess would be the Midtown and LesPaul sounds which isn't a huge loss because the Eb5 bass covers most of my needs anyway.
Yeah... pretty good free surprise upgrade, if that is indeed what's going on.