FWIW, in December of last year I received the notice shown on the left side of the image shown below and after activating it the maps changed as shown on the right side of the image.
I am currently on 8.1 (2017.32.6ca28227) and while I have not received a notice about new maps I just checked and see somewhere along the line the 2016 changed to 2017 as shown in the second image.