Warner Home Video has officially announced an August 28th release date for The Flash Season 4 on Blu-ray and DVD. That puts it out two weeks after Arrow Season 6 is released.
Bonus features available on both the Blu-ray and DVD editions include the following:
The Best of DC TV’s Comic-Con Panels San Diego 2017
Inside the Crossover: Crisis on Earth-x
The Elongated Man
Flash Time on Amunet Black with Katee, Eric and Sterling
The Fastest Mind Alive: The Thinker
You can pre-order The Flash Season 4 on Blu-ray and Digital combo at Amazon.
The Flash Season 4 stars Grant Gustin, Candice Patton, Danielle Panabaker, Carlos Valdes, Keiynan Lonsdale, Tom Cavanagh and Jesse L. Martin.