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If you want to enable it early, I believe you can go to about:config and set network.cookie.cookieBehavior to 5

Likewise you can keep enhanced tracking protection in general but disable partitioning (total cookie protection) by setting it to 4

https://support.mozilla.org/en-US/kb/total-cookie-protection...

Looks like it's already in v101.0.1. It's under the Settings | Privacy and Security tab with a new checkbox to allow you to "Test Pilot our newest..." It is not automatically checked for me.

I think the change might just be they will be setting that checkbox to on now? Although I don't remember seeing this option until now.

Mozilla occasionally rolls out features in the current release via remote mechanisms. So it's rolling out to existing v101 installs now. I would assume that v102 will also ship with it on by default.