Seeing as how the thread's active again, I thought I'd run a theory of mine by the Monolith fans of this site.
I've been obsessing over this game for a while, and at this point, I'm certain this has nothing to do with Xenoblade (aside from being its spiritual successor). The more I watch the trailer, the more I'm convinced that one of the basic premises of the game is that humans have crash-landed or have come to explore and
possibly terraform a primitive alien planet.
I've organised my thoughts and evidence presented in the trailer into a (hopefully) tangible analysis below.
Firstly, let's take a look at the gargantuan grey structure that we see throughout the trailer. I've seen many people refer to it as a wall protecting a human colony, with the various protuberances atop it referred to as sentry guns or turrets.
But upon closer examination, they appear to be cranes and pulley systems. I believe this structure to be the ship - a crash-landed ship, to be precise - upon which the humans came, and the cranes and pulleys are used to salvage debris and whatnot.
To edify further, take a look at this screenshot and note the terrain around the ship. There's a clear deformation there indicating something cratered into it.
The second intimation comes from the trailer piece- rather, the first section (spans about twenty-eight seconds before abruptly ending and giving way to the bombastic choir segment). The atmosphere, I feel, that they're trying to convey with that music is one of exploration of uncharted territory (within the context of my theory, a foreign planet). Similar arrangements have been used in various sci-fi and adventure movies, unfortunately, however, nothing specific is coming to mind at the moment.
Another element that lends credence to my speculation is the stark technological contrast being displayed throughout the trailer. We see a myriad of high-tech machinery and weaponry, but nowhere can be seen even the most faintest glimmers of human civilization- no roads, guideposts, or anything indicative of the existence of intelligent beings. Of course, I realize we've only seen one area of the game, and it's subject to change, but this lends more to the "humans exploring foreign planet" portion of my theory.
And finally, the biggest piece of supporting evidence is the concept art of a crashed-landed UFO Monolith released way back when.
Might the scenery in that image have served as the basis for the game? I know it's close to E3 and all, but I thought I'd do it for fun and to get my hype going.