Sorry to disappoint you - I'd have loved this as well. I just played SingStar again with my son, and my amazement of SingStar still keeps growing. This time I was trying out some of the backgrounds (there's actually a trophy for that) and just discovered that they have been like the new animated PS3 themes to some extent already. I selected a sunset, and the water of the sea actually animated, and a large flock of birds passed across the sunset from left to right, really beautiful. There's more like that too. Great stuff.
Ha, my son bought the static LBP wallpaper from SingStore when we were not looking. All I heard was "LittleBigPlanet, I want this".
We made him pay for it from his piggybank afterwards. He thought it's worth it and promptly shell out the money.
Anyway, the 'Singstar' bundle in this case consists of the original Beatles Rockband copy, but bundled with two Singstar microphones. In other words, if you've got a full band kit from buying Rockband or Guitar Hero previously, then this is the perfect way to fill out your full band kit to include the ability to do the three-voice harmonies that Beatles Rockband supports.
Bummer ! My piano is arriving this afternoon. As far as musical instruments go, the real ones take precedence. ^_^