Considering how popular the Mixamp is I can't believe they would stop production of the current model months before the release of their new model. Being that the sound card is the least expensive part of this set up I suppose I can get the Recon3D and be on the lookout for the Mixamp 3 or restocking of the current model. I just don't want to wait until 2013 to get all of this. If it does come back in stock on October 20th like Mjonir says than I should still be in the window to return the Recon3D.
Well, since they are already selling the Mixamp 2013 version with their headsets, I'd assume it won't be long until they restock them as stand-alone.
Look no further than just above your first post for a theoretical but official explanation from Beyer on this. On the practical side, you'll have to rely on reviews though.