Considering how little was done on that front in the recent big Talkback 9.1 update and how unsure the Talkback team was about it at CSUN, I doubt it.

The higher ups probably just don't see it as worth the trouble to support so many different models and translation tables when very few people can afford them (particularly those blind users most likely to use Android over Iphone), the amount of people who actually use a braille display with a mobile device on a consistent basis, and how few younger people know braille. They clearly don't appreciate how important it is for spelling, note taking/presenting/math, audio fatigue, or the Deafblind community, but neither does most of the world anyway so they aren't alone in that.

I think if there was a phone with a built in braille display I'd be an awful lot more interested in learning braille. Since there isn't, and I'm not really keen to carry around yet another piece of tech, I can't say I'm that bothered. It's likely for a lot of people who lose their sight without warning after childhood that listening to audio will always be faster than braille anyway. Braille would be easier to support if it was not so difficult to do well.