Turkey has different types of passports for their citizens. Which is very ugly thing to do, but whatever I think about it, it did not change till now and it does not look it will change in near future.
There are 4 colors of passports. Navy color is the common citizen passport, Red is diplomatic passport, Gray is for special government officers and Green one is the most unusual and special one. People who work in government more than 10 years can get Green passport (including army members, and union registered business men etc.), moreover their unmarried kids can have green passport too. This passport is like European passports, it allows you to enter many countries in the world up to 90 days without visa (which is very unusual for the rest of the Turks).
Till today Green passport holders were also HAVE TO get visa from Greece. But, today Greek and Turkish governments announced that from now on Green passport holders can enter to Greece.
The main follower of the topic was the business men from Turkey. Most of them hold green passport after being registered in a business union and owns a stable business in Turkey. Because they travel abroad a lot and green passport is very useful for them. Turkey is increasing business relationship with Greece since 1992 and Aegean cost cities are the main importer-exporters.
What is next?
Now the same people who ran after entering Greece without visa are trying to convince Greek government for 2 days limited entrance for ALL Turkish citizens to Greece. The main idea is to increase number of Turkish tourists visiting Greek islands and make more business with Greeks.
What about Greeks?
Till now, any Greek could enter Turkey without visa and stay 90 days in a period of 6 months. But, Turkey also passed another law and in very near future Greeks will be able to enter Turkey with their Greek identity card or driving licenses, which is very friendly I think.