I've only just noticed this second batch of recalls that they have mentioned on 29th February. Looks like models manufactured up to June 2015 are also affected. Quote from the Nikon page below:
In July of 2015, we announced that the shutter in some Nikon D750 digital SLR cameras manufactured in October and November of 2014 does not function normally, sometimes resulting in shading of a portion of images. Since that time, our examination of the issue has clarified the fact that the same issue may occur with D750 cameras manufactured from December, 2014 through June, 2015.
Therefore, any D750 manufactured from October, 2014 through June, 2015 is eligible for inspection and repair of its shutter.
Is this new shutter issue the same as the previous flare issue? There seems to have been so many recalls it's hard keeping track of them. I fully understand your reasoning not buying straight away. You also get the added benefit of paying extra to do their troubleshoot and product testing!
Not sure if it's been linked to already but the serial number checker can be found on the link below.
https://nikoneurope-en.custhelp.com/app/answers/detail/a_id/64946