Well, I checked the next RBN releases for Wii. I noticed there were only 9 songs this time, so I checked to see what was missing.
I've noticed for some time that what RBN has been doing is releasing two PS3 5-song "blocks" of songs at a time on Wii, and up until now they've released the full blocks. This time, the PS3's June 22 block was included, but "Creepy Doll" by Jonathan Coulton was dropped.
Is this a mistake in the list, or is there a valid reason for JoCo's song to not be included? Because I was really looking forward to playing his music. I sincerely hope this was a mistake, or that the issues can be rectified quickly.