The listing for Battlefield Bad Company 2 Limited Edition on GameStop includes a start date for beta testing of DICE's upcoming military shooter sequel (thanks Ant via Planet Battlefield). Here's word, though it is unconfirmed, and so should be taken with a grain of salt:

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.