I'm far more excited for Projects than the other stuff. OpenAI's Memories is their lock-in for me; I'd have switched to Claude if Anthropic had something better. Projects sounds like an even better approach.
Game dev. It keeps tabs on the type of game it is, background, genre, classes, theme. Notably the difference between one decision and another - it takes note when I say "Instead of Y, do X". Like if I show a preference of Chinese names, it'll give me more of that.