If you've been invited to try a Lifecycle Services preview you can enter a code or enable the preview here. Public previews ...

If you've been invited to try a Lifecycle Services preview you can enter a code or enable the preview here. Public previews are available for any Lifecycle Services user. Private previews are available only to users and organizations who have been invited to participate. 

To get involved in Lifecycle Services previews, you can sign up here for the feedback programs.