The website Toyark reports...
According to a report by Bloomberg, this license agreement signals the end of Mattel’s master toy license. Spin Master will be taking over the majority of the DC Comics licensing, with Mattel retaining just some of their previous categories. Mattel’s license will include “preschool and girls’ toys” while Spin Master’s boy’s action toy category will likely include traditional action figures.
That means things like DC Superhero Girls. But, what would that mean for anything Supergirl TV related?
Perhaps more can be found at the linked Bloomberg article or at the Spin Master Press release from 12/21/18.