Last week Microsoft released a beta of the OData Service for Team Foundation Server v2 along with a sample Windows Store application
The purpose of this service is to help developers work with data from Team Foundation Server on multiple device types (such as smartphones and tablets) and operating systems. OData provides a great solution for this goal, and has been embraced by numerous developers for building great device-specific applications. OData is accessible from any device and application stack which supports HTTP requests.
The OData service interacts directly with the TFS client object model, and will work with CodePlex, Team Foundation Server 2010 and Team Foundation Server 2012.
Read more about it here: http://blogs.msdn.com/b/briankel/archive/2013/01/07/odata-service-for-team-foundation-server-v2.aspx
And download the bits here: http://www.microsoft.com/en-us/download/details.aspx?id=36230