A Third Hero, Maybe a Dark Hero
We've been hearing a lot about Hero's lately too. Hero's are the huge King and Queen that players have in their bases. These are extremely powerful, very deadly, and essential to a 3-star attack or raiding a base.
While I don't personally think we'll see a third hero anytime soon, a few rumors suggest otherwise. Yes, SuperCell teased this on April 1st, but that was April Fools Day. Some say we'll get a new Dark Hero, even though Hero's take dark elixir to upgrade already. By this they mean an Evil or mean-looking hero that's even stronger than the King or Queen. At the same time, the game needs to stay balanced, so a 3rd hero doesn't seem likely. I'd like to see it, but don't get your hopes up.
A third hero could make higher level players absolutely unstoppable and make lower people think more than twice about attacking bigger bases, so this will need to be handled carefully. It's all about keeping the balance and making the game fair. We've heard rumors of a new Wizard hero, a Witch, or even something similar to the Hog Rider, like a Knight on a Horse that jumps those strong level 10 walls.