Months ago, EA and Sony promised a free digital copy of Battlefield 1943 for those who purchased Battlefield 3, but after the official release no such additional content was to be found. Now, after the threat of a class action lawsuit, EA is finally owning up to their pre-release promise.
On the official help site, you can find a detailed explanation of the promotion. The process seems relatively simple, requiring people to activate their online pass, login to a special site with their linked Origin ID, and then claim their free download code.
European players can take advantage of the promotion starting tomorrow, and American and Japanese players can do the same on December 10th and 17th, respectively.