Roblox Beta is a group of users who have opted in to receive updates before non-beta members. At this time, only developer forum members can opt in, Only a little under 3,000 people have access at this time.
The following is a list of perks that members of the Roblox Beta receive.
200 Player serversMembers of the Roblox Beta have the ability to set up to 200 max players per server, although most popular games do not exceed 200 players in one server.
The MessagingService allows game servers in the same game to communicate with each other in real time (< 1 second) using topics. Topics are developer defined strings (1-80 characters) that game servers can send and receive messages.
Delivery is best effort and not guaranteed. Make sure to architect your game so delivery failures are not critical.