It depends.
It depends on the agent and how good they are at handling and pricing short sales. Will most of them close at that price? Probably not. If I run through our mls stats of the short sales that closed most of them closed at or just below the listed price. BUT. The amount of short sales that actually closed is about 15-20% of those that have been or are listed.
I have 3 deals pending that are supposed pre-approved short sales. I'll let you know how that works out or if that is the "new" advertising tactic.