But for how long?

Given the currently unused new track, and the teaser trailer that comes out, as well a the airships that are now patrolling parts of Eorza there seems to be enough evidence that the events of the trailer might possibly become an in-game event.

Do you believe they will implement some sort of large scale in game battle like they depicted in the teaser? Is it even possible given the limitations of the engine? Will it work like the attacks we had previously on the cities except larger in danger? And if so, what sort of rewards could they possibly give for the 'last days' of Eorza as we know it?