In that initial glimpse and this one, viewers get a pretty good idea of what Jodie Whittaker will bring to the role.
One interpretation is that it portrays Whittaker’s Doctor basically saying that she is “sorry not sorry” for breaking the glass ceiling to take on the iconic role.
There is room to speculate as to its meaning, although it seems to be pretty obvious.
As an actress, she can say a lot without saying much at all.