I don’t know if this has already been mentioned, but the GFSv16 (future operational model) is now available on the Pivotal Weather site.
Looks like some significant changes were made to the model. Hopefully, someone more in the know can chime in.
https://www.emc.ncep.noaa.gov/emc/pages/numerical_forecast_systems/gfs/gfsv16/GFSv16 Project Plan Draft v1.0.pdf