Nothing really needs to happen inside Greece, it's the rest of the world speculating about what can or cannot happen that can drive the price nuts.
This. And part of the current price development is a Fontas-like pump and dump cycle: pump on good news (Greeks need to buy cryptos), dump some five days later. Get ready for a moderate correction this week. We won't see lower than $250 figures, though.
That is true. If investors/traders believe, that greeks will buy a lot of Bitocoins, price can raise, no matter if its true or not. This seems to be much likely the scenario now.