I thought about this too. The current HN title is basically the title used for this article on the NYT homepage. Prepending "New York Mayor" clarifies the significance of this "De Blasio" fellow.

<bikeshedding> Both titles have merit, both titles have flaws. Granted, in the shorter title, it's unclear that the "requirement" is of the school to offer it, not of the students to take it. In the longer title, who cares that it hasn't been formally announced yet, and it's unclear upon whom the deadline is placed. </bikeshedding>

Can't please 'em all.