Word on the street is that UFC 300 will feature a fight between Chandler and McGregor. It is also rumored that they will be fighting in a new weight class at 165 lbs while the 170 lb weight class is being removed and replaced with 165 & 175 lb weight classes. Seems like the UFC wants to make more champions.
I'm guessing all those rumours stemmed from McGregor's tweet:
https://twitter.com/TheNotoriousMMA/status/1751103834401730884"McGregor on 300 seals the deal."
With Chandler responding with:
https://twitter.com/MikeChandlerMMA/status/1751136622098485759"I accept 🤝 See you soon @TheNotoriousMMA #ufc300"
To me, this is nothing more than teasing, aimed at keeping the interest in the fight alive.
I don't see the UFC going for that though. They won't be throwing everything they got into that one event and it's probably not enough time to build enough hype.