Alright guys, I've got a theory on my hands.
In case you haven't noticed, it looks like they have shown off all of the Xenoblade music tracks.
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Now something interesting I've noticed is that there aren't any music tracks from Xenoblade X; now why is that?
Well we know that the DLC characters will be accompanied with multiple music tracks. What if Elma was planned for DLC, so they purposely saved the Xenoblade X music tracks for her DLC pack?
Another interesting thing to note is that we have not Elma as a Spirt, or any Xenoblade X characters as Spirits for that matter. The fact that we haven't seen a single reference to Xenoblade X whatsoever is suspicious to me, especially with the large number of Spirits that have been revealed.