If majority of the people will vote for, austerity measures will be implemented (pension cuts, tax increases, layoffs, privatization etc).
Otherwise Greece have to default and most likely to leave Eurozone and/or European Union altogether.
We are today in October and the referendum was made. Everyone know the results of it. I saw even the results of the pool in this thread. I am thunderstruck by both of those. How is possible to not known the debt you have to someone? How is possible to vote to not give the money to the owner? How is possible that the people of bitcointalk be so ungrateful.
Greeks have made the life of sultans for decades with the money of the others and don't want to pay back those money to the owners. This is accepted by 60% of the Greeks and by 68% of bitcoiners (bitocointalkers). This is really sorrowful. I have no words about this.