According to the news in their website (yet unconfirmed by any party): http://www.airporthaber.com/havacili...ni-karari.html
(Sorry, it's all in Turkish)
TK will start operations at INA only with 20-30 planes, after Oct. 29th. These will consist of un-connected flights only; all flights with domestic and international connections will still be carried out from Ataturk Airport! Full operations will be (supposedly achieved) only by the end of 2018 (not 2019, as originally typed!). Even this may be a somehow "time buying" case; it may get prolonged until the beginning of 2019 Summer Timetable... It goes without saying that Star Alliance flights will also stay at Ataturk. I now wonder, what other airlines (particularly BA, EK & QR to name a few, which have multiple daily flights) will react to this as it will be unfair competition for them, as long as TK remains at Ataturk. :banghead: I'm pretty much sure, that IGA partners have "much enjoyed" these news, if these will come out true. It will be a major loss of face, after all what has been commented, so far!...
However, INA/IGA partners will still have a small consolation: The Pax Guarantee to be provided by the State will start clicking during this quarter-time activities at the New Airport!