I already posted the two reasons that the songs won't show up in mystery setlists. Just because I'm too lazy to look up the original quote doesn't mean my post should be ignored.
Its a shame, I love doing mystery setlists.
But still in random quickplay! Yay!
Clutch now in RBN! Go download!
Now that the RBN is up, I thought I would update this with my findings.
I was able to get RBN songs to show up in Quickplay if I chose the Random Song option.
I was not able to get any RBN songs to show up in Make a Setlists in Tour mode unless I specifically chose them. I went into the 8 song Make a Setlist, and chose 8 random songs, I then cleared the setlist and repeated this multiple times. Never once did an RBN song show up.
In summary, it looks like the only way to play an RBN song in Tour is to specifically choose an RBN song.
It's just going to get confusing when RB3 comes along.