Hero 27 was first believed to be jetpack cat, but before the release of the new hero, confirmation surfaced that it was in-fact Torbjorns daughter Brigitte Lindholm.
On the Overwatch YouTube channel, a 'introduction' video has been released by Blizzard showing off how Brigitte is going to fit into the current roster.
It appears that Brigitte perhaps could be struggling with some father figure issues, this conclusion was derived from the following reasons: Has a father with an unhealthy obsession with machines and it is implied that he never paid attention to her, has Reinhardt as a role model since she was a little girl, mentions Reinhardt around 3 times in a minute and not Torbjorn once, in-game counter to Torbjorn and loves cats. From these reasons my guess would be that Reinhardt is Brigittes actual father figure even though he is of no relation.