This is the final Karaoke Revolution game to use the American Idol likeness and features. Konami will no longer use anymore American Idol likeness or license for upcoming future Karaoke Revolution sequels after this game. Songs downloaded from Xbox Live Marketplace for the first Encore game on Xbox 360 are compatible with Encore 2. The previous downloadable songs for the first Encore game on PlayStation 3 downloaded from the PlayStation Store will be automatically imported to Encore 2. Recently for the first time, Konami has released 5 new downloadable songs that never appeared in any of the previous Karaoke Revolution series before. However, these songs originally appeared from one of Konami's other musical game Rock Revolution.
Source: Wikipedia, "Karaoke Revolution", available under the CC-BY-SA License.