What 3DS feature are you terrified they might have cut in LTD? (Please tell me the Concert Hall is still there!)

I genuinely hope the songs are still in the game. I really need someone to confirm this for me to put my mind at ease! Has anyone seen any confirmation from Japanese trailers, previews, or leaks about the Concert Hall returning?

Also, what are the classic features from the 3DS version that you guys are most worried about losing?