I only knew about this because of an email that began..
Dear Big Y Customers,
We are still recalculating your Big Y results. We apologize for the delay and appreciate your patience during this exciting update to Big Y.
We anticipate this taking approximately 7 more days. During this time, you will continue to see “Results Pending” in the Big Y section. You will be notified by email once your results are processed and ready.
Below is a refresh on the changes we are implementing. We can’t wait for you to experience the new Big Y!
I will note that I got this email 10 days ago, so once again, Family Tree DNA has underestimated the effort required, in terma of how long this will take.
There is extensive discussion of the issue on Anthrogenica. Overall, I think the best approach is to be patient. People have noted the recalculation has changed terminal SNPs in certain cases. The standard for having a unique DNS change has also been adjusted. Again, dirty details are discussed in depth in the Anthrogenica thread.