While the current beta remains closed, a new beta will be hitting PSN this fall and it'll be open to the public. SuperBot made the announcement earlier today.
See the quote from SuperBot President Chan Park, after the jump.
"Last week, SuperBot Entertainment and PlayStation invited a small group of players to get a hands-on preview of PlayStation All-Stars Battle Royale as part of our early development beta. We’re beginning to test our servers and connectivity issues and this is just the beginning as we work toward rolling out a public beta to the entire PlayStation nation this Fall. As part of this exclusive access, players were able to take control of characters such as Kratos, Sweet Tooth, PaRappa the Rapper, Colonel Radec, Sly Cooper, and Fat Princess and battle in environments such as Dreamscape, Metropolis, Sandover Village, and Hades. The feedback we’re receiving from beta testers has been highly encouraging and valuable, helping us craft the best online multiplayer fighting experience possible."
Fernando's POV: This will be a much more telling stress test for Sony and SuperBot. A closed beta can only do some much as far as testing the servers. An open beta is available to anyone so much more people will be online with All-Stars. Count me in for the public beta.