I’ve commented on React 19 in the React 18 RFC, but it’s been more more than 5 months, so it’s fair to say a bit more.
There’s been no change in support or new plans for React 19, I can say it’s being discussed, but the timeframe between even a successful spike and landing that to Atlaskit would be multiple months, so I can pretty confidently say this wouldn’t land in 2025.
What I’m hoping for at the least is wider levels of React.StrictMode support as we clean up some technical debt from our React 18 migration, which for many packages will mean React 19 support (I’m not certain about the TypeScript error though), as today you will hit things like legacy context in all popups, modals, etc., and other blockers.
I’d say watch out for an RFC around React 19 similar to how we did with React 18, but I wouldn’t expect that to land this year.