Hi Cyclondude.
I think the early Eastern Europe maps had some major roads of Turkey included, but not much. (Sorry, I don't have them). There is a new Eastern Europe map, version 6.80 which doesn't include any of Turkey but there is supposed to be a Plus version released later in the year that will include Turkey.
Unfortunately, this will only run on TT6.
EDIT:
Typical! I've just found Eastern Europe map V608 on a DVD. It's 191MB and allegedly contains the following:
The Czech Republic, Turkey, Hungary, Greece, Slovakia, Russia, Baltic States, Slovenia, Croatia, Bosnia & Herzegovina Romania, Bulgaria, Serbia & Montenegro, Belarus, Moldavia, Ukraine, Macedonia and Albania, as well as the major road network of Western Europe.
I can't vouch for the accuracy of the above statement or the coverage, but I'll upload it to Rapidshare and post the links if you want to try it.