Battlefield 3 beta keys - for those that have pre-ordered the game through Origin, or bought a Limited Edition version of Medal of Honor - are being rolled out today.
Those invites should be rolling out over the course of this afternoon, granting players early access to the beta, which kicks off publicly this Thursday, 29th. At that point the Beta will appear automatically on both PSN Store and Xbox Live Marketplace. The beta will finish October 10th.
Participating regions will be North and South America, Europe, South Africa, Australia and New Zealand.
A breakdown of beta details can be found on the official site. But EA say you won't be able to carry over Stats from the beta into the game proper.