Thanks, Richard. Completely agree about using the familiar gear vs better gear.
For metering it really depended on how much snow vs volcanic rock were in the pictures. The majority of the time I perma-set the meter to ~-.3 and shot away. Realistically, that left me with pictures that were all a tad under-exposed and grey snow (because most of my shots were predominantly snow filled). But I can count the number of shots with clipped highlights on one or two hands and the latitude on these files is so great I dont think I really missed all that much in the end result.
Regarding batteries, I never once had to change a battery outside of the boat. If there's one thing, the M24X series battery is just incredible. I'd go out and shoot a few hundred pictures, with both cameras being exposed to ~30-40F weather (not too cold) and really only lose ~20% battery on the camera I was using most. Coming from Colorado I was used to shooting in the cold (below freezing regularly in the winter) and knew what to expect, so I was never concerned with battery to be honest.
Unless one really wants to get some long exposures or shoot IR, I'd leave a tripod at home for Antarctica. There's also little need to worry about removing gloves for a little bit in most cases. If the weather's really terrible, chances are you wont be allowed to leave the boat on a zodiac anyway. We had that happen once with 40kn winds, 10ft seas, horizontal snow, and fog.
I'll also say i was a bit concerned about condensation but that proved to be a non issue with how dry it is down there and on the boat I was on.