I'd say...and this is just ne thinking outloud, that the reason it's quiet at the moment is that Brad is working on some deal with GPG that would allow SD to create more content.
We all saw the two demigods being moulded in one of Brads video's....why else would those be at SD???
I'd say the first month took all the wind out of GPG's sails and they are happy to just cut the losses and move on. SD on the other hand may have a point to prove...and since they are great at providing patches with every other title they are invovled with i'd say they will spring us a surprise....though it may take some time.
Good thing League of Legends looks like crap (IMHO), otherwise DG may have been in real trouble.