I talked to one developer who actually gave me legitimate information and told me it was a hot mess. Like, there were so many different prototypes that small teams (4-5 people) working on them that just never got off the ground. But said two of the directions they were going, and I kid you not, this is a real thing that apparently happened. One was going to be like an RTS game for Half-Life 3. And another one involved live actors, and it was going to be a new type of adventure action game with actual actors. Kind of like Nighttrap but more advanced