User blog comment:GarryboiThe1337th/Sword Art Online: Alicization: War of Underworld set to premiere January 18th/@comment-2601:601:101:1AD0:3091:F3AC:D352:E9EA-20200119033103

Both Season 4 of Attack on Titan & Season 2 of The Promised Neverland are coming in Japan Fall 2020, so I'm guessing that Attack on Titan Season 4 & The Promised Neverland Season 2 are coming to Toonami in 2021