I read on the WCF Data services blog this comment:
Sorry, we do not plan to release WCF Data Services in V4. But instead we will release WebApi version for service bits. We already have prerelease webapi.odata at www.myget.org/.../aspnetwebstacknightly. You can have a try or you can have your own implementation of service with ODataLib API. Thanks
This was posted by the same person who created the post, so it seems to be from an MS Employee.
Whats more, the blog has been renamed to the OData blog and all the posts seem to be only about Web API (and related).
Has anyone heard any kind of official announcement on this?