Gears 5 Operation 2 begins next week. 2 maps for Vs (1 new, 1 returning), 14 player Free for All mode with 3 dedicated maps, 2v2 Gnashers maps, new characters, new Tour of Duty. Haven't seen any mention of new achievements.
There's a Gears 5 eSports tournament this weekend, streams Fri-Sun with weapon skin giveaways.
Forza Horizon 4 will have a free car in the Forzathon shop each day in December.