I think the next update should add multiple heroes. In addition to the barb King and archer queen, you should have something like the goblin king, Zeppelin/blimp, or maybe a Titan (giant King).
Of course it'd be unfair if you could use all heroes at once, so you should be able to choose only 2 to use for an attack. It would add more strategy to attacking and it'd add diversity. This would be so cool!
