Nick Feamster spoke on the past, present, and future of SDN at the IAB plenary session at IETF 84.  Slides are linked below.

1730 - 1800 Welcome
   1. Welcome - Bernard Aboba
   2. Open Internet Endowment Status Report - Lynn St. Amour and Russ Housley
   3. IRTF Chair's Report - Lars Eggert
   4. IAB Chair's Report - Bernard Aboba
   5. RSE Report - Heather Flanagan

1800 - 1915 Technical Session: "Software Defined Networking"

1915 - 1930 IAB Open Microphone Session

1930 Adjourn

Slides:

1.  IAB Report
2.  RSE Report
3.  IRTF Report
4.  Programmatic Internet (David Ward)
5.  Units of Evolution (Ted Hardie)
6.  Open Internet Endowment
7.  The Past, Present, and Future of Software Defined Networking (Nick Feamster)