Spoiler for Full game spoiler:
Did anyone notice that the Earth Dragon battle from the Moon OP never happened? From the looks of it it occurred inside the future earth shelter, and was part of some large-scale battle between guardian and gaia. I kinda would've loved to see that eventuate, haha.
Referring to 0:59-1:02 of this video
http://youtu.be/xeZVm8fnvhg?t=59s
Looks epic @_@