The only real concern you should have is two-fold. The answer shouldn't surprise you: (1) zero-down loans for subprime borrowers are dissappearing (2) stated-income loans, for subprime borrowers, are dissappearing. I say this shouldn't surprise you because it's common sense. People with spotty credit, with no money in the deal or without a demonstrative ability to repay the loan are bad risks.
In this market, with stricter lending rules, subprime homebuyers may need to rethink their price range and homebuying options. I think having the potential buyer discuss his situation with a reputable lender would be a powerful first step.
With the market being what it is now. As a subprime buyer it definitely is harder for them to purchase a home. Most of them will now need 10-20% down. There are exceptions of course but the more money they have to put down the better the chance they can get into a home.
I do loans in MN and would love to help you