In addition to having a public website, which will resemble the current The Settlers Online homepage, a new site will be set up as a place for the potential testers to register, as well as a new English-language forum going live. Here players will be able to find detailed information about the tests, various feedback and discussion topics.
So if there are any fans out there that want to participate, all you have to do is sign up when the new staging environment goes live on Wednesday. By participating you will get access to the testing community, get a chance to see new features and even test them out before they go live!
Source: Game homepage