Local Overrides, new accessibility tools, the Changes tab, new performance and SEO audits, reliable code stepping with worker and async code, and multiple recordings in the Performance panel.
0:26 - Local Overrides
1:46 - New accessibility tools
2:56 - New SEO and performance audits
3:41 - Reliable worker and async code stepping
5:08 - Multiple recordings in the Performance panel
5:42 - Bonus tip: Automating DevTools actions with Puppeteer