Here's the relevant part, since some people might not want to give UploadVR a click:
Valve To Show New 'Features And Updates' For Steam And More At GDC
The full statement sent to us reads as follows:
On Thursday, March 21 at 12:45 pm, representatives from Valve are scheduled to give a presentation on the Steam platform in West Hall 2011 during this year’s GDC. Topics will include a global market analysis, information on the coming multi platform networking APIs, a first look at new features and updates, and more.
Valve To Show New 'Features And Updates' For Steam And More At GDC