It could be possible to introduce a scythe like weapon in the vein of doublebladed weapons. Used by Rem, Zidane, and the Judge Magisters.
https://finalfantasy.fandom.com/wiki...-bladed_weapon
Of the weapon types currently in the game we do not have:
Whips
Scythes
Doubleblades
Rackets
Poles
Maces
Cards/Dice
Cannons
Bells
1 handed Axes
1 handed Hammers
and some more unique weapons not seen yet are
Gun-arms
Floating Weapons (Sage will be using this)
Whipblade
Dragon/Familiar (Primarily a Golbez and Ran'jit weapon)
Of the heavy armor wielding variety you can shorten this list to the uniques as well as Axes, Maces, Scythes and Doubleblades.
If they push for Scythes it very likely could be a hybrid between Scythe and Shadow Dragon if they want to pay homage to Ranjit since the upcoming xpac is looking to be very FFIV inspired.
Or if they decide to go with a Judge Magister type of job the doubleblades would fit in quite nicely. Could have a playstyle where you have attacks that use the doubleblades on it's own as well as attacks where they split into two different weapons.
And since Judges also used magical attacks with their blades you could put some aspects of the Spellblade recurring job in there as well and definitely pull from the WoL boss fight with the elemental sword stuff.
I really can't wait for mid May to see what it actually is. >_<