Yes, it's a new year, and that means when you update a file for the first
time this year, you should also update the copyright year for the file.
Often that means changing "1997-2015" to "1997-2016".
No, no one is going to do that for you. *You* need to do it. But only
for the files that you're otherwise changing. No bulk updates just to
change the copyright year.
Thanks.