Great piece by Serenity Caldwell at iMore:
iOS 10 builds off the design language iOS 7 introduced, but it takes a bold step of its own, meshing the best of the old iOS design with the current style to create something entirely new.
Judging by screenshots—I haven't downloaded the beta—there's a lot to like in terms of iOS 10's refinements, design-wise. From an accessibility perspective, it'll be interesting to see how these changes affect readability for those, like me, with low vision. At first glance, it seems the bolder fonts used for headings in Music and News are a huge accessibility win in this regard.