Hurry up now and check out Resistance 2’s website where right now you can sign up for the public beta that is going on currently.
Here is some info about the beta via PlayStation.Blog
The Beta will include competitive maps from three locations in the game. These maps include 60-, 40-, and 20-player maps from Orick, 40- and 20-player maps from Chicago, and the 10-Player map Sub Docks (Bay Area). New modes Skirmish and Core control will be supported, along with Deathmatch and Team Deathmatch. The co-op portion of the beta will focused on Orick, and will support randomization of your play-path. Both co-op and competitive will support matchmaking and class/character progression up to level 10. This will allow unlocking of new equipment, upgrades and berserks for character customization.
Now I signed up and around 4 hours later they sent me a code so your chances seem pretty high to get in.