Narball will be available for everyone on May 6th at Midnight PDT. The release version will have Steam P2P connections for private games with friends as well as support for dedicated servers and a simple form of quick-play matchmaking.
Narball will be relying on the Steam matchmaking system to connect players to open dedicated servers hosted by the community. If we get a massive spike in new players it could overload the quick-play enabled games, and we'll need help from the community to increase the server capacity. Private games should be unaffected.