Disney Plus is releasing today with all Star Wars films in HDR 4k, they are using the special editions for the original trilogy.
Moderator Edit: Just for information - these three threads may also be of interest as to the 2019 SE releases:-
Disney+ streaming platform : Star Wars content & various other info - in ‘General Star Wars Discussion’
Star Wars: The Skywalker Saga 4k UHD – 27 DISC Boxed Set – 3/31/2020 - in ‘Original Trilogy Discussion’
Changes to the Disney+ 2019 SE of the Original Trilogy - in ‘Original Trilogy Discussion’
as well as doubleofive’s comprehensive articles on the Original Trilogy changes for the 2019 SE (aka 4K Disney+ version) release at The Digital Bits website - SW : ESB : ROTJ - and doubleofive’s ‘Star Wars Visual Comparisons’ website, blog and twitter platforms.