They're not the only ones getting in on the action early. Medal of Honor Limited Edition owners will also be getting beta keys dropped in the mail at some point today.
"Please don't ask about 'when do I get my email' etc," said Battlefield 3 dev Gustav Halling via his blog. "We don't know. This is an automated system that sends a bunch out every hour starting around lunch today."
For those who want to gain access via their Medal of Honor purchase, you don't need to have the disc to hand. Halling explained via Twitter, "You just need to have entered the online code for MOH on your account."
Have a read of the Battlefield 3 beta details that were sent out back in July for more info.