All GFS 0.25° grib files provided by NCEP/NOAA after this upgrade do contain announced changes. I don't know if Windy downloads grids of all available parameters/levels: data is huge (>0.5 GB for each forecast), while downloaded grids may be filtered by both coverage, forecast, parameter and level.
Obviously not all available parameters and levels are available via Windy UI.
Anyway, introducing all parameters and levels on UI would be useless for most of the Windy users (e.g. some parameters are available for levels 0.1 hPa, 0.2 hPa, etc.); they would be only useful for research purpose.

@tandemtime
There are 2 currents layers in Windy.
Currents which includes all type of currents. As wind is the main factor of ocean circulation, its effect is take into account (but not sure for a local wind)
https://marine.copernicus.eu/news/new-catalogue-release-wind-wave-ocean-current-and-biogeochemical-variables
Tidal currents is deducted from variation of sea altimetry
https://community.windy.com/topic/15265/tidal-currents?_=1614707415967
Concerning waves models, WW3 model is said to include the effect of surface currents, WAM model apparently not.
Depending where you usually sail, these layers are interesting but it is advised to rely on other traditional and official information sources for currents and their effect on sea surface, specially near the coast.