PlayStation has been great at detailing what games are coming to PlayStation Plus Essentials/Extra/Deluxe over the last few years, but as far as games leaving, it’s pretty much a guess until the game is either gone or very close to being gone.
Unlike how Xbox do with Game Pass each month, PlayStation don’t advertise games leaving the platform explicitly, but the list of games for September, is pretty large including the likes of Horizon Forbidden West, Alien: Isolation and Marvel’s Midnight Suns. These are all set to leave the service in the coming weeks.
As far as games that got added this month, you can currently grab Harry Potter Quidditich Champions, and those that subscribe will also get MLB The Show 24 as well as Little Nightmares II for this month.