Nintendo has released another update for Super Smash Bros Ultimate today bringing the game up to version 10.1.0. Here are the details on this patch.
While the Sephiroth DLC support was already implemented with an update that released on December 17, the patch today will bring in support for the Mii Fighter costumes including Geno, Aerith, Barret, and others which were shown during a gameplay presentation hosted by Sakurai.
There are likely going to be balance adjustments for fighters that will be a part of this update but the official English patch notes are not live as of yet. They will be posted on the support website.
You can find out the details on the game balance adjustments from the Japanese website for now. We will update with the English changes once the official website posts them.
Here are the patch notes for the December 17 update that added Sephiroth DLC and a new gameplay mode for those who wanted early access to this DLC.
Note that you cannot make videos of replays that contain DLC you have not purchased (fighters, stages, music, Mii Fighter costumes, etc.).