Director Talks Possible Sequels: Part 4 and 5
One of the directors spoken about the future sequels during the conference in Beijing. There was an article but I can't find it at the moment. Basically it stated the following: The directors were indeed planning a part 4 and 5, but decided to instead re-release the trilogy in cinema with deleted scenes. There's always a chance the directors might go back to the trilogy, and create more sequels or prequels.
The article was posted over at www.monkeypeaches.com