I'm have been playing Socom 4 for sometime now I was in the Closed beta and I tested the game prior to the beta. There are some things they still need to be fixed but it looks promising for the PS3 God knows PS3 fans need it.
In regards to GR:
No not at all the game is slated to release Oct 1 2011 keep in mind it was supposed to release in Spring this year so they bumped it back some months who cares if it comes to making the game better. There is just no beta release yet.
Here is a link to release.