A joystiq posting says that "Rocksmith" is actually a repackaged "guitar rising", which has long been delayed due to 'note interference'. Did they finally work out the kinks?
And I agree being able to see what your finger positioning is, along with what string you are plucking is a HUGE advantage for rock band 3. Also it's nice that the guitar doesn't have to be in tune to play. There are plenty of things RB3 doesn't do though, so if Guitar rising can do them it would be a good game to also have too.
I do wonder, if rocksmith just reads pitch, how much point there is of a tablature game interface.
Unless it's just 'suggested fingerings'.