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Hello @Iridule and welcome to the Community. Please see this article for complete details. Sense and Versa 3 Battery Performance Program The article suggests that it might take a month to get to all affected users.
I also want to point out that this is not an optional firmware update once you get your update notice in your Fitbit app. This is a safety issue and your Sense will experience a factory rest if you don't install the update. Please stop using your Sense immediately if it gets hot while charging or feels warm while you are wearing it.
Laurie | Maryland
Sense 2, Luxe, Aria 2 | iOS | Mac OS
Take a look at the Fitbit help site for further assistance and information.