The Nabucco pipeline is supposed to be built from Turkey to Austria (via Bulgaria Romania and Hungary - not sure abotu Greece but I think not). This will indeed allow in the long run to bring gas form the Caspain and Iran to Europe, but do note that most of the gas currently in Turkey comes from Russia, so it might yet be turned into an additional route for Russian gas... - it will certainly allow for swaps with the Russians)

It's well on its way, I think, and could be ready in a few years.

In the long run, we're all dead. John Maynard Keynes