IE team announced completing of Access Control Check using the Access-Control-Allow-Origin header defined by the updated spec. This means that, in addition to the wildcard check (looking for *) supported in Internet Explorer Beta 2, also now support the origin URL check. This support will be part of the next public release.
The video below demonstrates how to use XDR and what this announcement means. It also shows how the Access Control framework is supported by other browsers allowing interoperable services to be called from your pages.