logically speaking since there are going to be 3 roles for tank and healer now, the algorithm may have been adjusted for that.
In addition, it may also have set bard into a classification that will include MCH rather than its own category or lumped in with the casters.
Remember the DF currently prioritizes diverse parties, and starting with 3.0 they're about to get even MORE diverse. The last thing you want on launch day is your brand spankin' new classes having to wait an hour and a half for queues because some shlub didn't code the algorithm to account for them.