Minecart with Dispenser

Minecarts with Dispenser is an unimplemented vehicle.

Usage
Other than the screenshot tweeted by Dinnerbone, no detail about its use, function, or activation method were published.

Trivia
In 1.5, it was made possible to put any block in a minecart by editing NBT tags. Dinnerbone was possibly demonstrating that functionality with the dispenser cart.