Hi Home Seller:
It is all negotiable depending on your financial status, assets, hardship and many other factors. It is most likely that they will not take anything, however, they may ask for you to pay for some of the deficit. Again, it is all negotiable.
I have worked with clients on short sales where the banks wanted them to kick in funds to close, and they said No...and the bank eventually said ok.
Hopefully you have someone that knows how to negotiate with the banks doing your short sale.
All the best,
Kat Becker, Realtor
Prudential California Realty