When you start a wildfly server from CLI and then create a deploy-only server in Eclipse and point it to your server's dir, the server adapter in Servers view should allow Show In -> Web Browser. Currently is disabled for me.
Also, when you deploy an app, you should be able to do Show In -> Web Browser on the module. Currently this is also disabled for me.
According to Max this should definitely work. As is also seen in his demo here:
https://www.youtube.com/watch?v=ng6jlGTfETA#t=7h05m40s