At the Detroit Auto Show, Tesla CEO Elon Musk announced that his company would supply battery packs and chargers to Daimler for the test fleet of electric Smart ForTwos. If Tesla were to hook up with Daimler and Evonik, it could potentially provide them a lower cost supply of batteries for the Model S and other future vehicles. At the same time, Tesla could contribute some of its battery management knowledge to the project.
More likely, Daimler will be looking for a larger partner that could provide economies of scale to the battery manufacturing.
[Source: Automotive News - sub req'd]