I've never felt that the 787 would really be a dream. Will the plane go much faster than a 707, I think not.
More comfortable than first class in a 777 or 747....probably not (though a lower cabin altitude is a nice touch)
While more fuel efficient, it isn't anything that will change the course of aviation is it?
Time for Boeing to dust off the plans for the 2707.
The dreamliner might be called "fuel efficient". The lower cabin altitude could be done right now by flying lower (just don't fly into a mountain).