Is the "magic" this line here?

> gem 'turbo', github: 'basecamp/turbo'

I get a 404 when trying to access it, so maybe still private till the big reveal?

Both Turbolinks and Stimulus will be launched in new versions so probably a private beta version.

Yeah I think the magic is something new. In the Rubular (I think) podcast for Rails 6 launch he mentions how he thinks front end is broken, and they are doing it in a new way/have ideas. This could be those ideas.