CSS Profile also moving to "prior-prior" format like the FAFSA

Paying for College
1

This will start with the 2017-2018 financial aid year, for which students will be able to complete the FAFSA and Profile in October 2016 using 2015 tax data.

http://www.forbes.com/sites/troyonink/2015/12/20/applying-for-the-biggest-financial-aid-awards-at-the-best-colleges-just-got-easier/

2

Been there, done that.

http://talk.collegeconfidential.com/financial-aid-scholarships/1838483-css-profile-to-use-prior-prior-year-financial-information.html#latest