If you watch the unveiling video for these Winterhawks jerseys, near the end when they are hung up in the locker room, on the left hand side you can see what appears to be a red version of this uniform...maybe a third jersey yet to be unveiled?
The sleeve is red with the dark cuffs, and a thin grey stripe; basically the inverse of the look of the main home/road but with a red base. You can even see the shoulder patch at the top.