According to the WWE United Kingdom Home Video Twitter account, today's Greatest Royal Rumble event will be released on DVD as a two-disc set at some point later on this year:

We can now announce that this Friday's #GreatestRoyalRumble from Saudi Arabia – headlined by Brock Lesnar vs Roman Reigns in a steel cage for the Universal Championship and an epic 50-man Royal Rumble match – will be released on 2-disc DVD! Release date TBC pic.twitter.com/PK9EFDj8Sp

, WWE Home Video UK (@WWEHomeVideoUK) April 25, 2018