Currently, 3 cities in Turkey are connected by high speed trains.
4 more will be connected by this month, when Istanbul-Eskisehir line is opened.
There are 4 new projects recently began, and 8 cities will be connected by the end of these projects.
Istanbul-Kapikule line is in plans, and is planned to cover three cities. However no budget is given this year. It will probably be postponed.
And there are some other projects and updates that are not written in budget, but announced by authorities. According to these plans, 27 more cities will be connected by high speed trains.
Here are the cities to be connected by high speed trains based on budget and all announcements:
Currently Connected (3 cities)
Ankara, Eskisehir, Konya (Ankara-Eskisehir, Ankara-Konya and Eskisehir-Konya lines)
To be Connected In May 2014 (4 cities)
Istanbul, Izmit, Adapazari, Bilecik (Eskisehir-Istanbul line)
To be Connected till 2017 According to Budget (8 cities)
Bursa, Izmir, Usak, Afyon, Kirikkale, Yozgat, Sivas, Erzincan (Bursa-Osmaneli, Ankara-Izmir, Ankara-Sivas and Sivas-Erzincan lines).
To Be Connected till 2016 According to Plans but No Budget (3 cities)
Edirne, Kirklareli, Tekirdag (Istanbul-Kapikule line).
Announced by Authorities but Not Mentioned in Budget (27 cities)
Manisa (via Ankara-Izmir line)
Balikesir (via Bursa-Izmir line)
Kutahya-Isparta-Burdur-Antalya (via Eskisehir-Antalya line)
Kayseri-Malatya-Elazig-Diyarbakir-Batman (via Ankara-Batman line)
Aksaray-Nevsehir (via Antalya-Kayseri line)
Corum-Amasya-Samsun (via Ankara-Samsun line)
Gumushane-Trabzon (via Erzincan-Trabzon line)
Karaman-Mersin-Adana-Kahramanmaras-Osmaniye-Gaziantep-Sanliurfa-Diyarbakir (via Konya-Diyarbakir line)
Erzurum-Kars (via Erzincan-Kars line