With a free software update, Super Smash Bros. Ultimate becomes compatible with the Toy-Con VR Goggles from the Nintendo Labo: VR Kit. Check out this video to learn more!
Looks like the dataminers were spot-on! Smash Bros. Ultimate is indeed getting Nintendo Labo VR support, and it's part of the 3.1.0 update. That update is set to go live tonight.