Firstly, the people talking about Xenoblade Chronicles X are definitely hiding something (most likely for the sake of spoilers).
Solfiner said:
It most likely isn't the only city. In one of the treehouse streams, one of them slipped up and said "this is one of the-" and then quickly said "This is the city hub." instead.
Makes you wonder why there are more cities, right? Neo LA is supposed to be the last hope of humanity, the only city that found its way to Mira. Could it be there are already intelligent inhabitants on this planet when humans land?
Speaking of the people who know about Xenoblade X, the majority of the argument against Xenoblade X being connected to Xenoblade comes from the first 40 seconds of this video:
https://www.youtube.com/watch?v=qKKiODpn6Fg
"So uh, Xenoblade Chronicles X is uh, it's sort of a spritual sequel for the original Xenoblade Chronicles for the Wii. Umm... Doesn't really touch on the storyline, but it does pick up on a lot of the philosophical ideas in that- in that first game."
This and that the people call themselves humans.
However, this does not prove the game has no ties. To begin with, the statement is clearly formulated on the spot, and he has difficulty framing just exactly how to refer to the game according to Xenoblade. He's rather vague. It is possible, although cannot be proven, that the reason he is so vague and has such difficulty is that he is avoiding revealing too much/spoiling. Note that he says, "Sort of a spiritual sequel," and "Doesn't really touch on the storyline of Xenoblade." The wording means it is possible for it to be not fully a spiritual sequel and to somewhat touch on the storyline of Xenoblade – the extent to which is ambiguous.
What this could look like is some time has passed between the events of Xenoblade and Xenoblade X. Xenoblade X does not continue the storyline of Xenoblade; it instead starts a totally new storyline that is in the context of the Xenoblade universe. Depending on the amount of time between the two games, characters from the first game may or may not show up again. Even if they do show up, they may not be the main characters of this storyline.
What I am raising is that Mira is the planet in which the homs and other life forms of the Bionis/Mechonis were living on at the way end of Xenoblade. Xenoblade Chronicles is the story of how that world came into being, it's history, in a sense. After all, Xenoblade's original name was "Monado: Beginning of the World."
To back that up, there is this suspicious observation:
Considering the Bionis and Mechonis sunk at the end of Xenoblade, it makes sense. Futhermore, humans could not have built this as they just got to the planet, suggesting previous inhabitants again.
Speaking of inhabitants, there are two in particular who raise questions.
First, the Shulk-like person. For context, it's from this video:
https://www.youtube.com/watch?v=6GxUMMGyZcM
The resemblance to Shulk is clear:
The character was singled out and emphasized in the video. It's doubtful that Monolith/advertisers would not realize such a resemblance to the protagonist of their previous game. So what is their game? Would they just show Shulk to everybody? Or, what I think is more likely, is this a descendant of Shulk? To me, the eyes of this person look green while Shulk's are blue. Fiora has green eyes though, and the two seem incredibly likely to get together.
As for the Nopon, Tatsu, you must know that Tatsu is the name for who we know as Satata in the French and Japanese versions of Xenoblade.
This nopon bears the same spiral glasses and name, but has a different color. For these reasons, maybe this is a descendant of Satata. He bears a large backpack and is armed with two biters. This is typical of someone who is travelling. Perhaps he was travelling from one of those other cities? Maybe, maybe not...
What about the character with the two Monado hairpins?
If this game is the future after Xenoblade happens, the events of Xenoblade would have probably become a part of history. The Monado would be well known. This person would have to be a hom then, and there's no way to distinguish between homs and humans since Zanza based the homs on the humans. The humans have the goal or rebuilding humanity to its former glory as is a theme present in the E3 2014. "This is the duty of Growth." So what if the two were to meet? You might expect there to be conflict.
There may be some foreshadowing of this at the end of Xenoblade. Alvis and Shulk created an entire new universe, which happens even though Shulk said "world" because he does not has no larger concept. Pay attention to what is said here (
or watch it)
--Alvis: "Shulk. This new world is boundless. It is home to not only you, but many forms of life. I can see it. In this world, all life will walk towards the future hand in hand."
--Shulk: "One day I hope I can meet them all. The people of this endless world."
--Fiora: "Me too. We will. I know it."
--Shulk: "We'll meet them, and whatever happens, we'll face our future together."
I will restate that 'World' refers to 'Universe.' Alvis even says, "This new world is boundless." When he talks of other forms of life in this boundless world, he refers not only to the life on that planet, but also aliens. Shulk and Fiora are sure they will meet that life, so it makes sense that the homs are meeting alien species in Xenoblade X.
Shulk wished for a world with no gods, and that is what Xenoblade X's universe is. This universe is just like Zanza's, or Klaus's universe, just somewhat different. Nobody comes into the position of creating a new universe like Klaus did. Also, if there were any gods in Klaus's universe, there would not be any in this new universe.