Magic system fills glasses from the bottom up somehow

OK, I don't believe in magic, but I'm not quite sure what I'm seeing here. This new device from Scotsman Beverage Systems fills glasses from the bottom up. How? I have no idea! It drops the ice in from the top, then the soda or the beer or whatever somehow enters from the bottom of the glass. Apparently, it's fast and makes serving loads of drinks at once very easy. It's also good at blowing my mind.

Apparently, how this thing works will be explained next week. But I want to hear your guesses now. How is this crazy contraption doing its thing? Am I missing something obvious here? Please, make me feel stupid, I'm curious enough to take it at this point.

CrunchGear, via Foodbev