Lake Mary may have been nicely frozen not long ago, but today there were thin slushy spots which caused concern (and turning around). At the least, skins and skis will likely get wet and then frozen (No Fun!). At the worst .... lets just say perhaps you might get more than just your skis wet.
1/11/2016: Lake Mary and Lake George appear to be well frozen, atleast for now, and skiers are crossing them.