The only publicly available information of which I am aware is listed, here: http://www.wharton.upenn.edu/mba/student-life/class-profile.cfm. This only contains GMAT data, though. You could try calling the Admissions Office to see if they have this data available for general consumption.
The Class of 2013 (this past year's first-year class) was the first class to be eligible to submit GRE scores, I believe. Therefore there are only two classes worth of data, so far (and I don't even know how many of those accepted applicants elected to submit GRE scores). In short, I don't know if there is enough data to present, at this time, that would have statistical significance.
What you can generally assume, though, is that the standards for the GRE are unlikely to be any lower than the standards for the GMAT. As a general rule of thumb, one would ideally like to be in the 80th percentile or higher for all subscores irrespective of which exam one takes. If one is notably below that percentile mark, one should consider other means by which to demonstrate competency and aptitude in that area.