While the next installment in the Battlefield series is about to release its beta, EA DICE are still working on improving Battlefield: Bad Company 2.
The latest update, which comes in at 2.6GB, includes a lot of changes. The most notable of which is the removal of DRM on the non-steam PC versions.
Other changes included, removing some memory leaks with the software, fixing crashes where the game attempts to render too much and preventing the chat window from causing lag spikes.
For a full list, check out the source.
Source: Battlefield Blog