They do. I was advised by JPL that "there will be two types of programming streamed from mission control. A version with commentary and interviews mixed in will begin at 3:30 p.m. Pacific Time, on NASA TV's "Public" channel. A plain version without commentary (the way TV news editors generally prefer) will begin at 3 p.m. on NASA TV's "Media" channels. Both channels can be viewed online at www.nasa.gov/ntv"