UPDATE: I just spoke with Origin customer service myself, and was told that this will be a multi-platform beta, per EA's Battlefield 3 beta FAQ. The Origin offer applies to the PlayStation 3, Xbox 360 and PC platforms, the rep told me. Platform-specific codes will be e-mailed to those with a pre-order when the beta launches in September.
You might have read yesterday about the recently announced retailer-specific pre-order bonuses for Battlefield 3. GameStop's offer seemed to be the best one, since the bonus you get adds weapons and weapon accessories to the game. Origin just one-upped it though.
BF3 pre-orders made through Electronic Arts' Origin store -- for Xbox 360 and PlayStation 3 pre-orders as well as PC, it seems -- include that GameStop-not-so-exclusive Physical Warfare pack (digital download version only) PLUS access to the game's beta, which kicks off in September. Free weapons AND early play. We have a new winner.