Not really to be honest.
The discussion wasn't "What's up with Round 3", it was "Applying to Stanford". I threw in the R3 question as early as I could, and he just said that they have Begun to send out interview invitations and will continue to do so through early May.
The remainder of the discussion was geared towards application questions, ex: "what is the minimum GMAT score?" etc.
Trust me, I would share if I knew anything else. My takeaway was to keep my hopes up until about the 10th-15th of May (no, DB did not give a date).