What do you think Kingdom will bring to the game?
I think part of it will be missions. You can send creatures on missions that last for a certain amount of time, and while they are on a mission they will be unavailable in the other aspects of the game (defense and attack). Missions will differ in duration and difficulty, requiring a given number of creatures, size/level and color. When you complete missions you unlock new ones, and eventually new part of your kingdom.
I also hope they introduce a marketplace, where you can sell and buy items, gems, gold and diamonds. Maybe even buy and sell energy.
What are your speculations? Add dots to creatures?