The rb2 free pack is the closest thing we have to breaking the rule. It was really just an extension of the rb2 export, which lacked rb3 features, but was released as dlc.
Why is everyone trying to find a technicality on this. The blitz songs will be rb3 enabled. It was obvious before and more obvious now.
The Free Pack was supposed to be released on launch day.
Fine. Everything except for one Track Pack a year and a half ago that I forgot about (and even that had harmonies).