SlotH42You can most likely contact Massdrop and ask if you could take over the order. If that isn't the case, there should be a couple of boards that will end up in one of the monthly bazaars.
mcvangIt's just like with ordering anything - people will cancel their order for various reasons (they no longer want it, different financial situation, found better product, etc.) The cancellation doesn't have anything to do with massdrop except that now they have an extra keyboard not claimed by anybody, so they're looking for a new person to purchase it.