In the run-up to an upcoming meeting between the GAC and its Board, ICANN has published a set of briefing papers. The page used for this also includes a proposed set of dates listed as ICANN's expected path forward.
Of special interest is the April 14 date listed as the date for publication of the AG. This is tentative and does depend on the outcome of the two GAC/Board meetings that will happen in Brussels next week and then in San Francisco on March 17.
But it also sets a clear target date for the start of the new gTLD program.