Idea # 0. Arcanum 2, as I said before. I think, there's no sense in making Ps:T sequel, 'cause Torment feels like a game, which never meant to be sequelled. But Arcanum is different matter. I can prepay 100$ for this!
Idea #1. Turn-based cyberpunk isometric RPG with emphasis on story, factions' relationship, lore, choices, moral dilemmas around implants, genetic engineering, space traveling, telepathy, caste systems,