[[Sorcerous Spyglass]] is legal in standard brawl even though it's banned in historic brawl. Honestly I'm surprised they remembered to ban disruptor flute.
Ugin, Nexus and Field are still banned despite being perfectly okay by today's power level. Tbh, Oko probably is too.
I really doubt they'll ban anything. Nadu is annoying but not egregiously strong compared to other hell queue commanders.
https://scryfall.com/search?q=banned%3Ahistoricbrawl+banned%3Acommander&unique=cards&as=grid&order=released
https://scryfall.com/search?q=banned%3Ahistoricbrawl+banned%3Aduelcommander&unique=cards&as=grid&order=released
There's basically no overlap between commander and brawl. In brawl they ban cards that specifically hose commanders or keep them from being played. In Commander they ban really egregious sources of fast mana and some things that are just generically strong (although it's up for debate if some of the older cards still deserve to be banned)