Having Mark Seibert or Chris Braymen or better... BOTH on board as the composer(s) would be a dream come true. Even having them work closely with Telltale's composer would be a gift for fans.
Crispin's theme in KQ5
Cassima's theme in KQ5
The underground gnome theme in KQ5
The entire intro theme in KQ6
Girl in the tower in KQ6
The intro theme in Conquest of the Longbow
Oh man, everyone of those are so good at building the emotional connection between the player and the game. They all give me chills. Having these guys come back would be an amazing idea.
BTW, I actually liked the Bountiful Woods theme from KQ7.