Here are the Call of Duty: Vanguard season 4 patch notes

Call of Duty: Vanguard season four is launching tomorrow, adding a familiar multiplayer map, new operators, new weapons, and several other exciting changes. 

Season four is adding the Call of Duty: WWII map USS Texas 1945 to multiplayer, which will feature a 24/7 playlist at the launch of the season. Castle and Sphere are also receiving minor updates. Bullets will no longer penetrate the wall near High Ground on Castle and an issue preventing the Glide Bomb killstreak audio from being heard in Labs on Sphere has been fixed.