After seeing those prototype figures, I started thinking of a mutant series for Chima (especially with the crocs). Like, some of the characters become so corrupt with the power that they get caught in a halfway form-pretty much like how the proto croc figures look. The bird tribes could use the new chicken suit arm piece from Series 9 of the collectible figures and maybe new helmet pieces. That type of thing, you know. Though the figures would probably be hideous to most people, I think it could be an interesting turn.
I also think a mountain based theme could be pretty sweet: The heroes have to go through a mountain range and the caves on it to reach the wise owl elders living in solitude to learn more about history/tribes/powers in the land. Inside the caves, they would come across the new villains for the wave-bat and spider people. That's pretty much all I have right now.