I think the EU has said that they are not trying to cut pensions, just to stop the early retirements.
According to the WSJ, pension spending has fallen 13%:
Greece’s Pension System Isn’t That Generous After All - Real Time Brussels - WSJ
The current Greek government says to vote them to stay and they will continue negotiations to get more favorable terms. The EU troika and Germans and French heads of state say this is a vote on staying in the Eurozone. If we believe them, there is no new negotiations possible.
If I were a Greek, I would not believe that negotiations can be restarted with the current Greek government. It appears that if the current government is kept in power, their will be no money for the pensioners. So pensioners will be totally destitute.