An extended 6.5x284 would have more capacity than a 6.5-06AI of course by design and as Ross said it should be faster which also is out of the box for Weatherby who normally load pretty hot. It could be we are missing a few details, I can handle waiting another month to see. With a '06 case head this would make a Remage possibility if I ever saw one. I could build one of those and have an '06 or 270 barrel in the safe to pass the rifle on to my boys if the factory round doesn't make it as most of their generation don't load their own. I have a Rem 270 that would be great with that long Rem action!
I would say if they get more competitive which they may be able to do since they left Taxifornia and there are good brass sources and ammo not too high they might pull this one off. It will be fun to watch the speculation though until the facts are presented.