For the Senior competition (which has a program description but not a solicitation), this change will be effective AFTER the November 16, 2016 and July 19, 2017 target dates. The subsequent target dates will be January and July 20 (or next business day) of each year.
Other DDRIG Changes - please refer to the revised DDRIG solicitation (17-506) regarding the following changes:
Target dates instead of deadlines
Revised target dates (as noted above)
Two-time submission limit per student
Other aspects of the Senior and DDRIG competitions, including the program scope, merit review procedures and proposal requirements, remain the same.
http://www.paleoanthro.org/home/detail/97/