The highlight of my day for me was definitely the wwdc presentation of the San Francisco font creation.
I warmly recommend anybody insterested in design to watch this talk, as it highlights the difficulty behind the creation of a useable font.
Additionaly, Figma's designer, Rasmus Andersson just released the version 2 of his Inter UI font. This font is available on GitHub and was designed with a particular attention to legibility, particularly at smaller sizes.