1. Automatic drink maker: http://www.youtube.com/watch?v=PgiT5b8Z5UE
2. Automated drive through machine: http://www.youtube.com/watch?v=Nxz6DSwL17s
3. Electronic order terminal: http://www.youtube.com/watch?v=UB4wqyVRn7o
4. Full on vending machine convenience stores: http://www.nytimes.com/2003/11/13/us/vending-machines-don-t-... (Failed, or were reduced to Redbox?)
Some projects take off, some fail. I like the automated order machines, but maybe they confuse too many people.
They probably don't roll all this out super fast, because being as large as they are, there's enormous risk in changing everything over night. I'm not sure, they may have to balance the shiny new methods against the interests against franchisees, who don't want to constantly retrain employees. But probably (hopefully) most of the good ideas are being tried out in some McDonald's somewhere.
They probably don't yet have "the robot that makes 360 gourmet burgers an hour," http://motherboard.vice.com/blog/meet-the-robot-that-makes-3...
But maybe it's easier to experiment with things on the margin at that size, so replacing your entire burger process probably lags a few years behind the technology.
You can say the same for any corporation or institution out there. Why are colleges still teaching the same way since 1850?