Hi, during the 40% off promo last Januari I booked a trip to Japan (AMS-IST-HND / KIX-IST-AMS) in J-class for in November. Now TK can cancelled it's direct flights to Istanbul from Osaka, so now on the website they offer me to make a extra stop in Tokyo (layover time 15 hours :-( ). I have the following questions:
Am I entitled to get an open ticket valid for any date following involuntary change policy?
And if so, can I also change my destination in Asia for free(no fare difference) or need it be the same flights/destinations?
And how will this type of ticket appair in my overview on the TK website?

Hope someone can help me!