Cannon now cause splash damage to all nearby units and buildings so beware of mixing melee attacks and cannon or you might end up trashing your own troops!
I'm sure I've said before that the hardest bit about this dev lark is the testing. If there's a 10% chance of a cannon hitting at long range and a 10% chance of a neighbouring building catching fire then there's a long wait to check it works correctly.
In this vid I cheated and made it 100% probability that the buildings would burn.