Standard Smash warning applies
Super Smash Bros Ultimate will be getting another update shortly.
An ingame notice appearing tonight in Smash Ultimate indicates that version 1.2.0 of the game will be distributed "in the next week". Patch notes will be made available when the update is live.
As with Smash Bros for Wii U / 3DS, replays will not be viewable if created in 1.1.0 unless they are converted to video in the Vault. (Vault -> Replays -> Replay/Data -> Convert to Video)