Gordon Baker (the other ice-out blogger :-) has posted an update over on the Algonquin Outfitters Blog with an update on the Cache Lake ice thickness from Wednesday. The short version: 8" of snow, 14.5" of white ice, and 5" of black ice.
I have observed total (black plus white) ice thicknesses in the winter ranging from 8" - 24", usually about 16"-18", so this sounds about average. The temperatures have been a little low in March so far, and the layer of snow will keep the ice insulated. So I think we're looking at an average ice-out this year -- mid to late April.
I have received almost 100 ice out date predictions so far, but have been too busy to update the site. I will have time this weekend, so look for the big list to appear tomorrow or Sunday.