Have you already taken a look at http://www.wharton.upenn.edu/mba/admissions/financing-your-mba.cfm?
To be blunt but honest, there are already many students who are eager to study at Wharton (and at other world-class business schools) under current conditions. Naturally, Wharton wants the "best" students and will try to do what it reasonably can to help those less well off obtain reasonable financing options.
All that being said, there is no "free money." By the time one is ready to undertake an MBA, one should already be able to assess one's own future career potential. Loans are a common and "dominant" way of funding MBA education. Think about it this way - if you are not investing in yourself and confident in your earnings potential (and the ROI of your MBA), why should others invest in you?
In short, an 85% scholarship grant from a single Wharton-based source is highly unlikely. A wise applicant would explore funding (grants, loans, scholarships, etc.) from a variety of sources, as FF suggested. Yes, the MBA is NOT cheap by any means; it is truly an investment. For some the investment will be worth it; for others, more careful reflection and analysis may be required to determine if now is the best time to apply.