I dont think he will return to this game after all of the effort he put in already and not to mention moving onto his other projects that he has been for years trying to get into motion but he was too preoccupied with Urban Demons and A Zombie's Life.
And off topic, GlassFish did put up on her Twitter she was thinking of revamping some scenes she did for Urban Demons but I dont think it was for any intention of returning to the game but mostly to touch up and improve ones she did to show her own growth in her animation skills.
So far this game is only just left to the mods to have fun with, but personally the two known who are working on it made it an even worse mess then this.
One is just loaded with too many characters that dont serve any purpose to the games plot or progression which makes it slower to run and too bulky to download. And the other is full of bugs and issues that are far worse then this version of Urban Demons that Nergal left it at (but with Nergal's, his can actually be worked around with and avoided).