I understand that you are hoping for a yes or no answer to your question. Unfortunately, there is no definitive answer. Each bank is unique and each individual situation is unique. We are in unchartered waters with the number of bank foreclosures occurring at this time. While deficiency judgement is certainly a possibility, I believe that it remains to be seen what avenues the banks will pursue on a consistent basis.
One way of avoiding a deficiency default judgement is to have a forgiveness clause written into an addendum to the purchase agreement. Of course, this only works in situations where the home is being sold in a short sale situation prior to expiration of the redemption period.
I Hope this helps, and best of luck to you.