British company, Let's Pizza provides hot pizza vending machines in Europe and is now planning to come to the States. This is not frozen premade pizza, but kneaded and the buyer is able to select ingredients. It takes approximately 2.5 minutes to make.
Atlanta has just gotten into the food truck industry in the last few years, so I hope we've progressed enough to have these too. Sounds like fun to me. (and of course reminds me of the old jokes about sliding pizza under the door.) You can see their website here.