I saw an interview with Surefour and another with IDDQD where they talked about Brigitte.
They both said close to the same thing. They don't know if she's going to change the meta, but has the potential to do so. They also both think she is too strong and will be tweaked.
IDDQD mentioned that the only reason they are keeping her on QP for so long is Blizzard wants to get a lot of numbers on her. That seems to line up with Blizzard buffing Reaper and Mei in case a tank meta starts, I think they are afraid if the impact that Brigitte could bring.
Surefour outright said her ultimate might be one of the best in the game, while IDDQD said it was very strong and that he prefers armor to shield.
It seems to be in line with what a lot of people are saying, she's too strong...but might not necessary have an impact on the meta simply because dive will still be too strong.
I'm really curious to see how Season 10 will play out, so many changes coming for that season, Brigitte, D'va and Zen nerf, Reaper and Mei buffed. I think the Reaper buff might end up being the most impactful, more than Brigitte.