Google throws up no answers at all. It's not new hardware, but some old graphics cards had either pins or plug holes in a 2x16 format which was used to plug in stuff like "mpeg2 accelerators" but Ive never actually seen hardware for it and wondered if you could get TV out PCBs to plug into it.
Matrox used such a port for their rainbow runner video-in/out upgrades. Compaq used to sell VESA upgrade cards for their pentium classis systems. Other brands did have the ports on their cards and sold those VESA things, but i've never seen them being used. Prolly because those things were way too expensive and only good for a few things wich the avarage user would never use. The only thing i've seen those connectors being used for, is for controling VESA compliant TFT screens from notebooks, to produce 640x480 @ 16color display for statistics displays.
