As expected Microsoft announced Forza Horizon 4 at their E3 press conference today. The game will be set in the UK and will feature a "Dyanmic, shared open world" that will run at 4K at 60 frames per second.
The big feature of the game is that it will feature seasons which will impact how the game plays. Easy races in Autumn will become much more difficult when the season turns to winter.
It also looks like the game will feature world events which will allow players to work together. The game will be available on October 2nd, 2018.