Considering their way of balancing since 3.0 I'm expecting the following changes:
Mch: Either flat out buff to their dmg with a follow-up buff for brd in 4.3 and subsequent buff to Mch in 4.4 as they seem to balance them agains each other instead of against all other jobs (hello double ranged meta)

Brd: Or in case they realize Mch is super strong already = Buff to their dmg in 4.2 (propably in form of benifiting from their own raidbuffs) with followup buffs to mch in 4.3 and Brd buffs in 4.4

Drg: Flat dmg buff because it's "unfun"