The new design of the San Francisco typeface is, unfortunately, a step down in terms of legibility for users using Latin characters with diacritics like me.
Here's a comparison of the before and after of the new update:
The problem isn't the usual “find Waldo” UI nitpicking. I only found it because it was much harder for me to read, and keep in mind, I'm 18 years old.
I hope this is just an oversight on Apple's part, but if this goes through to public release, I don't think I can recommend the new update to my parents, considering they're already using the enlarged system font size setting.
Apart from the size change, there's a new design for the diacritics as well.
The WWDC session video didn't address this change, but the description is undoubtedly ironic.
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