Hello,
to say it one more time: It was never intended to remove boards from coreboot. All that was discussed is to stop pretending that things work (that don't) and instead keep them on branches where it's easier to keep them working (if somebody has interest).
If that will happen again, it will be right after a release. And most likely due to the state of the code and *less likely* because of missing board-status uploads.
You can expect that it will be announced in advance.
Nico