Overall, I see the future for UI typography being all about sensors and font formats that can respond to data acquired from these sensors, and eventually also new typographic tools that have contextual awareness which integrates more intelligent algorithms to our workflows.
I'm excited to see where this world goes, too – we've come a long way in the past 10 years. Lately I've been using SF for everything, not only in the things I design but also in the products I use. My Mac, iOS devices, Watch, and even this website you're reading now (if you're on a Mac/iPhone) are all displaying SF – so really, I mean everything. But I wonder where this goes next – will contextual typefaces emerge that adjust based on what I'm reading and where/how I'm reading it?