The Unlocks section of the game's menu system lists a variety of weapons, ten of which read "buy this weapon on Xbox Live Marketplace" when highlighted. The game also displays a model of the weapon which can be rotated and viewed at any angle, leading some to speculate that the weapons are already packed in the game data.
While many elements in the beta versions of many titles are often changed or scrapped prior to retail release, the inclusion of a microtransaction seems an unlikely candidate for overhaul as Bad Company nears its June release.
Another EA DICE online shooter, Battlefield Heroes (PC), was recently confirmed to include microtransactions to support its free-to-play pricing structure.
Shacknews has reached EA for comment, but the company has not responded as of this writing.