Hi,

Any recommendations for filming and photographing in Cold Weather / Ice using a Mavic?

Warm up your batteries before taking off. Carefull with the exposure and white balance. Monitor your battery throughout your entire flight and don't take it too far away, as the cold temperatures will affect your airborne time and the time left prediction can get inaccurate. If you get any battery error, go down quickly and put the battery back on a warm place. Careful with the lenses when taking them outside or back inside, you might get some condensation if the change of temperature is too abrupt (Just as it would happen with your glasses...)

Nd filters

Also watch out for the battery on your phone.  Especially if it's an iPhone.  My battery drains exceptionally fast when it's below 20F.