Till a fedora version gets stable it will be in the development sub-folder. Just afterwards when stable it will be moved into the F42 folder. This is the same with the beta content of the Fedora Website where you download it.
The atomic desktops from “Spins” will be released more or less on the same time. If there are still troubles with it on the release day, shortly after things will be fixed and released. While the Workstation/KDE and the Silverblue & KDE atomic desktop can delay a release, the Spin based desktops will not.
Stay tuned and be patient
p.s.
Updating from beta to stable is normally not a big issue. Especially if it is an atomic desktop.