With the recent incorporation of native rubrics in Sakai, a next step would be to surface that data for instructors so they can use it to identify weaknesses in the instruction or the items being assessed. For example if a rubric identifies grammar usage as a key component in writing a paper, being able to compare all resultant areas of a rubric for students in a course or section could help faculty address areas for improvement based on the data. Further if the data is exportable, sayin a CSV or PDF format, the data could be collected and passed on to, or included in accrediting data. This could highlight specific areas of programs or just courses that need improvement.
With the rubric tool, the data is now being gathered, it may simply be a means of creating the proper calls/views and buttons to surface the data as such, though other processes may need to do average calculations etc.
I could see this being highlighted from within the gradebook (NG) as an item in the current under something like "View Aggregate Rubric Data" or "Rubric Summary".
I'm not sure if CSV export is more desirable over a view of the data, as the CSV could provide incorporation of the data offline but the print view would facilitate faster inspection and use of the data within a course timeframe.