The SharePoint Server team runs a "Testing and Adoption Programs" (a.k.a. TAP program), which is a private program where customers get direct access to members of the SharePoint Server product team on a regular basis to discuss potential new feature ideas, design proposals, early access to builds with new features, and more. We also have monthly webcasts with the product team to share the latest product information and have open discussions with our customers. If you're interested in participating in this TAP program and are willing to actively contribute on a regular basis, please reach out to firstname.lastname@example.org and request for join. We'll work with you to determine if you're a good candidate for this program and go from there.