Ive been scouring the GDC's website over the weekend and the amount of topics that are going to be discussed is impressive. Ive been able to track down two main themes sony is doing at the conference and that is talking about PS4 and Vita development. Both are hour long presentations.
Vita:
http://schedule2013.gdconf.com/session-id/824155
PS4:
http://schedule2013.gdconf.com/session-id/824243
Outside those two main themes, pretty much every developer within Sony it seems will be speaking on some level of game design/development. SCEA,SCEE, SSM, MM, Sony Bend, many of the indie developers who worked on PSN games. List is massive. I am also interested in what the slate of Japanese developers who are speaking will say. Their schedule is below:
http://www.gdconf.com/news/dragons_dogma_la-mulana_tokyo_.html










