Eliminator went in Fury because we saw people expressing a desire for it once we released HD, we wouldnt have seen people missing it without and initial release and would likely have tried something else, I probably cant say for 100% it wouldnt have been there, but I'd say the chances are it wouldnt. the fact when we released HD people expressed a desire for it in reviews and on forums made us rethink and rework it for inclusion in fury.
The delivery method does not really affect how long the content takes to create, the levels / art work etc, still take time. The only way to deliver earlier would have been to have put more poeple on the project, something we werent in a position to do. Plus there are little things such as blu-rays take longer to get out from master sub to release (with download there are no discs to press etc), maybe only a month or 6 weeks more, but it would all have added up.
Edit - HD was always intended as a download PSN title