Rockstar Games has filed trademarks for GTA TV and Rockstar TV. Like most trademarks, it covers such a broad spectrum of possibilities, it's difficult to tell what the service (I assume it's a service), is going to be if and when it releases.
Something tells me, though, that this is going to be a way for users to upload their crimescapades in Grand Theft Auto V to the cloud, and share with other users. I'm just guessing, really, but that seems to make the most sense. And hey, who wouldn't want to show off their massacre of the Los Santos Police Department?
Tell GR: What do you think GTA TV could be?