IDE support would definitely be great. There are no official plans to support IDEs, the main priority for my day-to-day work is to handle batch-mode refactorings through a console interface. If anyone is interested in contributing IDE support don't hesitate to reach out!
I'm playing around in my free time with an LSP implementation for Scalameta semantic API in https://github.com/scalameta/metadoc Metadoc is meant for online code browsing however instead of iterative development workflows. I'd love to integrate with https://github.com/dragos/dragos-vscode-scala, but haven't found the time yet. For IntelliJ, which I personally use for local development, I'd love to have something too. However, my experience with intellij-scalafmt is that IntelliJ plugins are more complicated to develop/test/release.