A patent application filed last year describes a new PlayStation Vita configuration which includes HDMI and USB support.
The application was published on February 7. That image above was included in the filing, dated July 27.
Sony, of course, has an event scheduled for February 20 at which the next PlayStation console is expected to be formally revealed. If there's a new handheld configuration, it could be announced there as well.
Update: We've heard from someone familiar with the Vita's development hardware that this could be the patent application for the devkit.
A Sony representative has told Kotaku the company does not comment on patents.
New Sony Patent Reveals New Ports Coming to PS Vita [PatentBolt via NeoGAF.]