I hope they go ahead and give us 1 primal for each of the 6 basic elements.
We have titan, ifrit, garuda, and leviathan covered atm.

Ramuh could be from sylph (though they dont wanna summon)

And Shiva could be from another coming beast tribe.

Of course in the future expansions there could be more as well

I just feel like if we stop at the current 4 it will feel like we're being held back.

Also there is the roaming odin, not sure how he'll tie into things.