Older generations left behind.
There are to be no more songs added to Rock Band 1 and Rock Band 2 – all future DLC will be exclusive to Rock Band 3.
It doesn’t matter if the songs are labelled “RB3 version” or not, Joystiq discovered – they won’t work with older games in the series.
Harmonix’s defence? That there are new authoring standards, new instruments and new in-game venues and lighting to program for. The new content is simply incompatible, it seems.