Might get flamed for this, but I tried a few award searches using the new calendar. And it actually worked! Low days had quite a few low flight options.
Looked at basic domestic 1-stop itineraries. Ie OMA-LAX in November. Economy class.
For every green day I checked on the calendar, corresponding flights were available at the "Low" level.
that would be a major ^^^ if true. Such as annoying problem.