The only way to get access to the beta in North America for now is by pre-ordering the game at your local GameStop.
There are a limited number of slots available in the beta, so tokens will be doled out to customers on a first-come, first-serve basis. If you already pre-ordered, you can bring your receipt to a GameStop starting on August 9 for entry.
No info was given on international players, so if you don't live in the United States, you won;t be laying the beta (for now, that is). So suck it, everybody who bragged about how awesome was the PS3, only American PS3 owners will play it =P
Anyway, if you haven't registered yet, MOVE!
Also, who's already registered? I want names, people! XD