Each release gets a flight tracker table, and each flight tracker table is populated out of with the transcluded "status" sections lines of the Feature Pages that are currently in-flight and targeted for that release.
Release targets are just that: targets. If something is not ready in time for a release, it is very simple to move that status block into the next release's flight tracker. The flight tracker lets us track things which are likely to hit, they do not commit projects to merging before they're ready.