In an interview from the Los Angeles Times, James Cameron talked about Avatar 2014 (Avatar 2), among others testifying that this sequel will go directly to the rainforest to the ocean planet of Pandora:
"We created a vast world for this project. Not just Pandora, but the hole system Alpha Centauri AB. We will explore this system and we will incorporate into the story - not necessarily in the second film, but certainly in the third. Part of my plan for Avatar 2 is creating a different environment on Pandora. I will focus on ocean and Pandora, which is as diverse, the crazy and original as rainforest. Do not say we'll see what I've seen so far, but we'll see something else. "
So as we see there will be for sure Avatar 2 movie and as we know for now the release date for Avatar 2 will be 2014. In the other way we also know that there will be an at least Avatar 3 (a trilogy???). That's all for now.
"We created a vast world for this project. Not just Pandora, but the hole system Alpha Centauri AB. We will explore this system and we will incorporate into the story - not necessarily in the second film, but certainly in the third. Part of my plan for Avatar 2 is creating a different environment on Pandora. I will focus on ocean and Pandora, which is as diverse, the crazy and original as rainforest. Do not say we'll see what I've seen so far, but we'll see something else. "
So as we see there will be for sure Avatar 2 movie and as we know for now the release date for Avatar 2 will be 2014. In the other way we also know that there will be an at least Avatar 3 (a trilogy???). That's all for now.