See this article that outlines that Barclaycard plans to release a credit card that incorporates a London Transport Oyster card. Providing trials are successful, Barclaycard plans to roll out its next-generation credit cards to its customers in London next year.
The idea of combining an Oyster card with Barclaycard and Barclays Connect Visa cards follows an exclusive contract between Barclaycard and TranSys, the consortium which runs Oyster card in partnership with Transport for London (TfL), due to run for at least three years.