From Gamestops website
"Reserve Battlefield Bad Company 2 and receive access to the PC multiplayer beta. Beta begins January 28th, 2010 and ends February 25, 2010. Available for online customers only while supplies last. Not available for in-store or in-store pickup orders.
Online Customers: A beta activation code and download instructions will be emailed beginning January 26th, 2010."
http://www.gamestop.com/Catalog/ProductDetails.aspx?sku=647589
So far those of us who are looking forward to participating in the online PC beta from January 28th to February 25th, start collecting those penny jars scattered throughout the house and pre-order soon.