Originally posted by Nefrarya:

You can find info about the Public Test Branch here:
https://steamcommunity.com/app/892970/discussions/5/3185737486646051111/

You should definitely back up your files before participating, but you can also use new characters and worlds if you want to help test.

I think what they are asking is will there be a public test dev hosted "Server" to play with others to test cross play.

Not just a build they run.
At least that is my understanding from what they are asking.