I actually have zero interest in fighting Omega so I personally hope it subverts previous raid chains and has the final fight be something else.

Also, for people who keep mentioning Sephirot and Sephiroth, just stop. There's no need to handwave anything. They purposefully misspelled it to differentiate the two. Even in Japanese the primal's name is "セフィロト," Sefiroto. Sephiroth is "セフィロス," Sefirosu. Instead of a handwave they would most likely crack a bad joke about how similar their names are.

I'm still selfishly hoping for a FFX crossover in some regard, personally.