The commercial for Lopez's show is on Fox Soccer Channel all the time, so I've seen it to the point where I can recite it along with him. It mostly consists of him yelling "Lopez".
Also, there's the promise of "late night... like you've never seen it before". I've not seen the show, but I imagine that there's a monologue, maybe a sketch, then the guests talk about their latest film, and sometimes someone plays a song. I've seen that before.