It isn't surprising that the cork goes up, the frozen liquid occupies greater volume and there is nowhere for the air to go.
RESULT - I just got my wine. Shipped on Tuesday. Ground. Northeast to Midwest through the coldest week of the winter. And... The wine appears to be fine. The corks are not raised at all. The wine in the bottle moves albeit very slowly. I have now placed the wine in a cool spot to acclimate slowly.
I am very relieved. I didn't really want to try out a Les Suchots Popsicle tonight. Now I'll hope that the wine inside is really okay. But we will wait awhile to find out that part.