A vita TV is a PSVita without a screen. You connect it to the TV instead, just like a regular Playstation console. I am not sure if its digital only. It can do remote play to a different TV from your PS4 aswell, and it upscales Vita games to 1080i.
And wow Vita is N1 in sales in Japan this week. Moving 80k+ with the PSVitaTV.
I still think those PSP software sales are canibalizing Vita numbers. A 300k ++ opening would've been more impressive, but ah well... it was pretty good regardless. Hopefully this holds. The Vita deserves a better fate and the haters deserve to eat crow for not knowing what they are missing.