The Other Darrin: Hazama and Bang retain their new Extend voice actors (Doug Erholtz and Steve Kramer respectively).
This extends (pun not intended) to the dubbing company as well. When the localization team changed from Aksys to Arcsys, they also changed the main studio from Bang Zoom to Cup of Tea Productions, which means Hazama and Bang's recasts are permanent.
What Could Have Been: This was originally going to be the Grand Finale for the current story arc, but apparently Mori still had so much left to cover that he had to save it all for another game. He claims the arc is "80% done" as of this game's ending.