Sony filed a patent
for a Vita that includes HDMI and USB ports. The patent, spotted by Patent Bolt
, was filed on February 7 in the US and includes a detailed run-down of the hardware, including the above photo of a Vita with HDMI and USB connection slots (25 and 24, respectively).Update
: This configuration matches that of a Vita dev kit, so it could be as simple as patenting that (existing, non-public) model.