Some details apparently from Famitsu:
https://gonintendo.com/stories/355709-platinum-reveals-project-gg-which-is-targeted-for-all-existing
- The action feel of the game is important but not the main focus of the title
- Launching on all existing platforms, as long as they can
- The goal is to have 100 people working on it, but 15 people are actively working on it now
- This new 100-person team will be working at a new studio in Tokyo
- Tencent offered to publish and fund this game, but Platinum refused because they want full control and ownership