This project is not going to change much from its current form. I fix bugs (and fight browser regressions), but I don’t intend to grow it in scope or overhaul how any of it works. As such, there is no roadmap.
React integration is not something I am interested in working on. My personal attitude to React is that it’s not a good idea anymore in 2025, but I know most of the JS community is still very attached to it. react-prosemirror might be worth looking at if you want to put React components inside of the editor, but comes with its own complications, due to the way React introduced hard-to-control asynchronicity.