To answer questions:
Yes, the Sprite and the Tengu-Nose Demon are familars in SotN....but from what I've heard the extra items from Nocturne (Alcarde/Alucard Spear, Rainbow Cloak, etc.) are not...and neither is the additional stage. You do fight Maria for the Holy Glasses, though.
Original Rondo and SotN are unlockables that you must find in secret locations in the game, rather than just beating the game and unlocking them.
And, the fact they didn't keep the old, awful dialog hurts me. It was terrible as hell, but dammit...that's what made it great and memorable!