There's more changes to CF in the prerelease than just "Azul Java support", and indeed it's about more than just CF itself (but the various released CF installers and CFBuilder as well). In this post I list those things, both features and resources, both to inform those who may be interested in the various things that are coming and to help motivate some to check out the prerelease before final release (which could be any day now).
[Update on 7/20/21: Just hours after I posted this last night, Adobe announced suddenly via a public CF forum post that they were putting the move to Azul on hold to Dec 2021. There had been no mention of that in the prerelease before then. And I can see now in the prerelease that the new installers have been removed, but the changes per the CF updates and for Lambda/serverless are expected to proceed.
You can see a question I asked in reply to that forum post, about what this means for the features that WERE seemingly only in the new installers. I've asked it in the prerelease forum as well, not knowing who if anyone may answer me.
It is indeed just terrible timing that this announcement came out just literally hours after what I wrote, throwing things into a state of confusion currently. Still, much of what I write below still stands. I'll update things as they may change]
What new/changed features the prerelease offers
In brief, the prerelease addresses these changes or improvements: