It appears as if Sony have announcements brewing for Game Developer's Conference in San Francisco (March 17-21). In an interview with Igameresponsibly.com Developer Relations Manager Brian Silva said the following:
''GDC is the busiest week of the year for our Developer Relations group. I can't say much, but we've all been hard at work with some great stuff that developers and gamers will be excited about.''
This also appears to align perfectly with the recent tweet by Tony Clark, Director of Business Development at SCEE:
"This is such a MASSIVE year coming up! Lots on for #PS4 #PS3 #PSVita at #GDC #E3 #Gamescom and so much more! Exciting!"