For some reason, we have seen numerous recent postings about ETIAS. Lots of articles written about with most of the information being wrong. As well as much of the information posted here.
Nothing official has been announced. They have been postponing this thing for years. When it becomes official, when exact dates have been announced, when all the boxes have been checked, I guarantee there will be plenty of it talked about on this forum. With correct information. And no, you will not be given one day's notice to apply for one.
But for now, chill. .