Gizmo and accessory manufacturer Scosche has some crazy stuff on the horizon with their Bluetooth "smartROLL" dice. They work via low power Bluetooth, and, well, serve as real-world dice that can be also used in game. It sounds crazy, and it kind of is, but check out the demo in action from the E3 show floor:
Scosche is actively looking for developers to build things using the dice, and, as mentioned in the video, they're totally open to the possibility of there even being twenty sided versions of these. They should be available to the public later this year.