From NIH's website:

NIH Grants Policy Statement (10/1/2013) - Effective for all NIH grants and cooperative agreements with budget periods beginning on or after October 1, 2013. See 10/1/2012 NIHGPS for prior budget periods. See NOT-OD-14-001 for description and notable changes since the 2011 version.  See also the Significant Changes document (PDF - 74 KB) which summarizes the significant changes in this revision of the NIH GPS (also attached here).