Hi Yellow Snow,
Just worked the difference in figures out for a 380 departing from either K2 or K3 in winter weather. Can still get out at max weight but change from K2, which most calculate from currently, to K3 equates to a 3 degree difference in flex( assumed temperature ) for T/O. This applies equally to the ULR flights and the European departures.
I am not a performance expert, but we are informed those few degrees make quite a big difference in engine life expectancy.
Suspect you will still get requests for K2 in the morning unless there is going to be a big delay.
As others have said. Nice if we can all work together on this one!