Actually, your renewal date may not change if you qualify in the 13 month (EK is smart enough not to give you a free extra month!)
The same happened to me this year:
- My review date was Aug 31 2016
- I was going to be short 5k points as of Aug 31 but new that I would get those missing points and then some the next month, so I let it go on the basis of the 13 month qualifying period
- At the end of August I received an email saying that I hadn't re-qualified but that they *extended* my review period by one month till Sep 30 2016 (how nice of them!)
- I got the remaining miles on Sep 5 and qualified
- My next review date is Aug 2017