When does Rolex announce discontinued models? Or do they?

[japenney]

Do we simply wait and view the yearly calender to know if a model is discontinued? Do they make a formal announcement if a model or specific dial is discontinued or does it just kind of happen out of the blue? With baselworld around the corner it got me curious if anything else will be retired. I remember when the black dial milgauss was discontinued it just kind of disappeared from the paper calender and website without a word (as far as I can remember).

Say for example the deep sea blue was discontinued (unlikely). How and when would we find out?