Rumour: Rock Band LEGO on the way?

A VG247 source claims that the next Lego game will be based on Rock Band. Travelers Tales has not commented on the rumour but in an earlier interview they confirmed a Lego game will be released this year, but kept its identity a secret. The rumour that the next Lego game will be based on Rock Band comes at a surprise as Lego titles usually adopt a popular movie franchise. Earlier rumours claimed that the Lego title would feature Harry Potter and friends, a rumour that Travellers Tales refused to comment on.
Source: Nintendo Wii Fanboy