On the Fulbright website under "Post US Student Application Review" (https://us.fulbrightonline.org/country-review-resources) it says "By March 2, 2018: In addition to entering Country Decisions in Embark, Posts and Commissions must email both the IIE Regional Portfolio Manage and ECA Branch Offices with the Country Decision list (including Principal, Alternates, and Non-Selects)."
To me that means that the beginning of March is when the countries have to send IIE their choices and after that IIE has time to review them. Probably we won't find out the decisions until much later.