Conditions here are just really random, no way telling if things will be in or not. Múlafjall needs about 5-7 days of steady sub zero temps to get in. We have had a very warm winter, just some short cold periods. Now winter seems to have arrived, been snowing for a few days and people were out climbing last weekend. But you will basically just have to post here a few days before your arrival. Jan/Feb are pretty likely to get some ice but you never know. If you have access to a car it would be highly likely that you can find some area in, or go a bit higher up. Worst case scenario, climb some cauldrons in the outlet glaciers. But hopefully it won’t come to that.