Hello,
as the title already implies: ReThink | Evolved 4 has been released on the 6th.
You can find more detailed information about the game and its changes/additions in the Changeblog for it: https://store.steampowered.com/newshub/app/1260580/view/2105937327552351376
or on the games Storepage: https://store.steampowered.com/app/1260580/ReThink__Evolved_4/
Aside from ReThink | Evolved 4, all the other ReThinks are on Sale for the entire Week.
Thank you, have a nice day, stay safe.