Probably an AST dps buff. Not even kidding.

They mentioned wanting to buff certain dps classes because they weren't doing enough damage for their apm/"complexity". AST is suffering from low popularity, slightly low on rdps and high apm, which fits their criteria for more buffs. Sadly they'll likely ignore the bloat or try to improve the card system.

WHM will probably get a very minor tweak to keep them quiet. Something like Cure III mana reduction or Lucid dreaming buffed by 50 potency again. I'm convinced they don't want to buff WHM because it's popular and if they actually made it a good healer, it would drown out the other 3 in terms of usage. It's much easier to leave WHM in the gutter than actually have to fix it and AST + SCH.

SCH, they might go after Energy drain again. I wouldn't be surprised to see it become 50 potency and Broil 305.

I'm 101% convinced and would bet large sums of gil that we won't get any large, meaningful changes or reworks. Remember, we went through the entirety of ShB, the development of 6.0, a new healer class, another AST rework and it's practically unchanged and in many ways worse. The dev team hasn't changed. Their mindset hasn't changed. Expect more of the same.