Following up on the speculation that the next Overwatch hero is a cat or Torbjorns daughter can now be done, as we now have confirmation from Blizzard that Brigitte Lindholm is on the way.
On the Overwatch YouTube channel, Blizzard have released two videos, one video is a origin story of Brigitte and the other is a Developer update which is narrated by Jeff Kaplan.
From both of the videos we can understand that Brigitte will be falling into the defensive/support role, much like Reinhadt. Brigitte and Reinhardt are tied in two as from the origin story we discover that "Eventually, she realized that serving only as a mechanic wasn't enough, and that the best way she could aid Reinhardt was to become a warrior in her own right. While Reinhardt trained her in combat, Brigitte began to build her own suit of armor in secret."