I'm very interested in the development of reports in ArcGIS pro too. I work in Local Government in the UK and am in the process of trying to move more of our databases away from Access and into ArcGIS, but we currently do all of our reporting in Access 2013 because it is quick and easy to do compared to ArcMap, I can embed photos and .jpg of maps, and the final output can be quite slick looking (depending how much time I have!) If the reporting component of AGP could produce as good results as Access 2013 for our needs then it would help the case for using AGP full-time.
The things I'm looking for in reporting is:
1. Embed data driven snap shots of sites in the report (I currently do this manually using .jpg exports)
2. Embed site photos using attachment links
3. Stylish templates for quick reports
4. Ability to easily create own report designs and templates
5. Attractive and professional looking outputs
6. Display the output of select by location queries on the fly, e.g. is a site in an Area of Outstanding Natural Beauty?