Also got this. Have a booking IST>CDG>US East Coast. The IST>CDG leg is cancelled (doesn't show on my reservation but flight is zeroed out). Going to be an interesting fix for them. I am flying out on Thursday. Wednesday has the flight scheduled then nothing until Sunday. KLM doesn't look like a great alternative as their one flight appears very late in day so likely an overnight in AMS (there are worse issues). It will be interesting to see what they come up with. It is on FB points.

Edit: Actually correction I guess Friday wasn't zeroed out but just fully booked. They moved my departure a day later which is ok by me.