Its not personalized though it’s a list of news websites they chose instead of content based on your follow and likes.
It’s a bit different:
The new For You feed now won’t just showcase a range of popular, but diverse, accounts, but will customize its suggestions based on the user’s own “friends of friends” network. That means the content from public accounts that friends of friends follow will be surfaced in the new For You feed. - Techcrunch
Doesnt seem to be active yet, looks like that feature is still closed beta.
I really hope they include an option to customize the For You feed. I don’t want pure recommendations I want a chronological feed with every 3rd post be a recommended one. I don’t understand how zero platforms/apps have a merged feed to have the best of both in one feed