I don't know really, why is it expected to do well? The hype for those games is gone and the previous one is enough for a casual friends over party night, there's enough DLC for it to keep the playlist fresh even if you play a lot. It will still sell some on account of the new tracks.
Real instruments are a nice addition (especially that Fender Squier that's for once a real guitar indeed, the ones with the buttons looks kind of bleh), but the learning curve for pro mode won't attract that many, and the instruments are also expensive.







