"I just wanted to clear up any misunderstandings about Shijima's post on the European forum. His comments were directed to his community and it is a mistake to think that the Beta will only be comprised of Europeans.
We will be releasing more information on the Beta for MAG in the future, but we can confirm that it will include users from North America. I know some of you already assumed that but I wanted to make sure you had the official word on it."
i doubt it will free or easy to get in, but i really hope i'm wrong!
to get in the uncharted multiplayer beta, you need to pre-order infamous, so i think that sony will do same for the beta codes for MAG, meaning any ps3 exclusive (or not) game will need to be pre-ordered or bought, having a release date prior to the start of beta testing.
however, i think that due to the sheer number of players required (256 on a single map!) MAG developers will need to make it easier for PS3 online players to get in.