JetBrains has released Toolbox App 2.6 with remote development support and extensibility through plugins
https://blog.jetbrains.com/toolbox-app/2025/04/toolbox-app-2-6-is-here-with-remote-development-support/

There's no information that they are going to deprecate the Gateway App,
but it would be nice to provide a Toolbox plugin for integration with DevSpaces.