Hello,
sorry for the confusion and thank you for being so eager 
. The 100% code complete is more about Fedora don’t need to do anything, the Change has just an informational character. Just to be clear it will be a technology preview to get the feedback soon, not a 100% completed installer replacement.
We won’t release the beta during the F37 release cycle. There a few reasons for that:
- we do want to use F37 GA payload
- not that mandatory but we can avoid solving other issues with payload instead of focusing on the Anaconda
- we would like to avoid noise around the F37 release
- people should have more capacity for feedback of our solution without taking the capacity from F37 release process
- easier for us to announce the release because most of the F37 news should be already published
For these reasons we decided to publish the ISO about a week after the F37 GA release. The exact date could change. Right now, we are working on fixes, improvements and trying to decide the best way of getting your feedback to us.
Don’t worry, we will announce the ISO release.