I know the economics of all this are horrendously complicated, but reading the full spectrum of comment and analysis in the papers today, there appear to be 2 outcomes;
No vote - Greece leaves Euro, returns to drachma, immediate hyperinflation then settles down to reasonable debt-free prosperity, Germany loses €300bn of debt
Yes vote - Greece stays in Euro, ECB maintains immediate liquidity, IMF insists on Greece's debtors (Germany foremost amongst them) taking a severe haircut on the outstanding debt to the extent that allows Greece a working, if austere, economy.
Is that it? If so, poor old Herman the German must be feeling a bit miffed at the EU right now. Still, having paid for Greece's new roads, air terminals and comms infrastructure at least they'll get those sunbeds cheap next year.