User blog comment:Kogath/Monster Hunter 4 Ultimate for the Nintendo 3DS/@comment-7725279-20140717200949/@comment-2194133-20140718071607

I'm thinking it is Amatsu and this is CAPCOM's way of teasing its return. Usually, or at least as seen in MH3U/3G, there is one end-game elder dragon that is never trully shown in the trailers. Sure Dire Miralis appeared at the end of the intro but that was not a trailer. Dara Amadyura was only briefly shown but it wasn't followed up on nor did it appear elsewhere. There are many monsters possible to return so it would be impractical for CAPCOM to spend trailer time teasing the big bad when there are other returning monsters to fill that trailer time.

I hunted one down yesterday and throughout the battle it was just clear how similar the cloud and weather was in comparison to the trailer's mystery monster. In terms of possible differences in battle and area changes, perhaps the Whale Dragonship is used in its flight mode to fight it briefly, like Jehn/Darehn. The "Final Showdown" could perhaps be at the Fortress or Town as we see in the trailers. We have seen the Whale Dragonship take to the sea and it is also used to travel from village to village so its possible to be used once more in an aerial battle. (These are just my personal thoughts however),

Also, I think we should also take into consideration that Amatsu is the only MHP3rd monster to be exclusive to that game. At this point what is CAPCOM going to lose if they bring it back? MHP3rd has already been stripped of its titular and prominent monsters in all the following games so why not bring over the last monster of that game over? It is understandable if other 3rd Gen monsters like Alatreon do not return as they had their lime-light in several titles but Amatsu is a monster who has yet to return in 4 years. I think it is time we finally get to see/hunt it again,