Master Chief will never be a thing.
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Kazuya Mishima from the Tekken franchise is officially coming to Super Smash Bros. Ultimate for the Nintendo Switch. He will be the latest DLC fighter coming in Fighters Pass Vol. 2, a pack that also includes Min Min from ARMS, Steve & Alex from Minecraft, Sephiroth from Final Fantasy VII, and Pyra/Mythra from Xenoblade Chronicles 2.

There is still one more fighter that has yet to be shown off for this Fighters Pass, so stay tuned for that one! Just keep in mind that it's probably not Master Chief.