As said during the F2F, now that the Future interface is in the DOM specification [1], it would be great if the usage of DOMRequest was dropped in favour of Futures. Generally speaking, it would be a good rule of thumb to use Futures for any asynchronous operation
Mounir says:
So, DOMRequest should be removed from the spec.
http://lists.w3.org/Archives/Public/public-sysapps/2013Apr/0129.html