Fermion
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Does the Greek government even have the wherewithal to print & distribute new Drachmas? (Presuming that they've long since destroyed all the previously obsolete ones.)
There was some mention that they do have a printing press in Athens which is used to print Euros.
I predict what will happen is the Greek government will establish a one for one exchange rate of New Drachmas to Euros. The Euro will still be used everywhere else in Europe and will be the real coin Greeks want. The black market exchange rate will be a lot lower than 1 Euro for one New Drachma...probably more like 10 Drachmas get you a Euro on the black market.
The government will pay pensions in Drachmas, so essentially everyone has voted themselves a 90% cut in pensions.