Bryan,
I am not on the Business Analyst product team so not sure what is on tap as full fledged custom report designer on the local Business Analyst Pro side. What you can do now is build a custom report or infographic in the web app (BAO). This gets saves as an item in your portal, which you can then run on the Pro side.
This is strictly my own opinion that on the Business Analyst Desktop side of things the probability of any further enhancement related functionality between it and Business Analyst Pro I would think is strongly doubtful.
If you have some ideas what you would like to see on the BA Pro side definitely creating a post over in the ArcGIS Ideas portal is a good idea.
ArcGIS Ideas
Regards,
Jason R.