Can't say for sure, but I'm going to assume that it will be. Aside from streaming movies, I've never come across a live youtube stream that you need to pay for, nor do I see anything on the youtube page indicating that we'll need to pay.
One wierd thing ... in the game thread, a couple of posters seem to be 3 minutes ahead of me. Not sure if that is because my streaming feed is delayed versus their feed, or if the radio is 3 minutes ahead of the streaming feed.