We roll out a public beta test with existing customers to ensure performance and reliability before doing a GA release. This allows customers to use the new product and provide feedback as well as help us to ensure a great level of service when the product goes full GA. So it's really a way for customers to test out new products early, but the specific details are specifically light so that if there are any major changes in the beta period we can roll them out.
Certainly the GA release will have all of that information, but given that large product releases like this are about a year of work, and part of the release schedule for us is a beta test with existing customers the introduction is basically to invite customers into the beta if they want to participate, and also that is the final step before GA release.
Customers who want to be a part of the beta are using the actual product that we are developing, but we don't commit to specifics publicly incase things change, which is why it's a beta release, not GA.