Seems pretty obvious to me what they are planning on doing.

While any one of the content can be beaten with any class/job, currently, certain jobs are able to do much more damage than the other jobs due to having access to a certain cross-class abilities. We do have plans to adjust these cross-class abilities to balance out all the jobs.
We currently feel that the bards are a little too strong due to the amount of damage they can do without being impacted that much from the fight.
Sounds like a Raging Strikes nerf to me.