NSF has issued a draft of the proposed PAPPG for the coming fiscal year. The PAPPG is generally released in October, with implementation in January.
This call for comments provides applicants and the general community with an opportunity to provide input that helps shape NSF procedures for proposal submission and award management. Comments are due July 29, 2019.
Federal Register notice: https://www.govinfo.gov/content/pkg/FR-2019-05-29/pdf/2019-11124.pdf