Fonts being updated?
I was poking around in the beta platform just now and noticed quite a change in appearance. Not sure if they want comments at this point or if this is just early experimentation but people may want to take a look.
There is a bit of a tradeoff between legibility and how much of the name displays that I'm not sure what I think of. I do think that the list of children looks too crowded.
If no one else sees this, it is possible my Firefox is just acting up today. But one thing that is definitely real is the change from all caps in the tabs bar.