Recce'd it today (latter half anyway) and can confirm how bloody cold it was. We all had frozen eyelashes and I had frost on the outside of my jacket after the run across the top from Jacob's ladder. The new checkpoint location appears to be as you go through the gate towards Jacob's ladder, instead of heading to the left after the gate, you head straight on down the track a hundred yds or so to the checkpoint, then head sharp left (or straight across if you fancy) towards the ladder.

Edit - hope that makes sense as I've not done the route before so it's all new to me either way.