I don't know if the music will be similar, but the same composer for DD and BD (
Kirill Pokrovsky) will be doing the music for the next gen game.
DD had health regeneration with the Survivor's Instinct passive skill, and BD had health and mana regeneration (with the rate determined by your stats). Unless DD2's combat, skill, stat and potion systems are changed dramatically, there is at least a fair chance that some form of health and/or mana regeneration will be available.
Near the end of development for BD, forum members who could make it to Larian's office could arrange a time to show up and playtest the game (for a few hours, IIRC). They may or may not do something similar (or completely different) for DD2.
Welcome to the forum.
