Rather than locking players who don't cough up the $10 for a pass from multiplayer completely, EA has decided that it will just stop them from accessing the rewards earned. The two multiplayer modes, "Explore" and "Global Events" give the player credits when you play them, which are then used to unlock new content.
Those without a pass will still earn the credits, but be unable to use them. Essentially, they're being put into a bank account you won't be able to access unless you pony up the cash for a pass.