The Backdraft 4K release is timed to coincide with the direct-to-video sequel Backdraft 2, slated for release on May 14th.
Tech specs include Hdr 10 and DTS:x audio. The inclusive Blu-ray is the previously released version and will include all of these legacy bonus features:
U-Control: Scene Companion
Ron Howard Introduction
Igniting the Story
Bringing Together The Team
The Explosive Stunts
Creating the Villain: The Fire
Real-Life Firemen, Real-Life Stories
Pre-order Backdraft on 4K Ultra HD, Blu-ray and Digital combo for a discounted price at Amazon.