There are three prominent colors featured: red, blue, and yellow. This could reference the different X-Men comics which are X-Men Red, X-Men Blue, and X-Men Gold.
Great season opener. It introduces new characters, recaps the story up to now, visits the existing characters where they are following season 2 and introduces new powers/antagonists while taking us on a visual acid trip while propelling the story forward in an entertaining way. Far out man!