James Cameron has unveiled the full official title of the third Avatar movie: It is Avatar: Fire and Ash. Cameron unveiled his title at D23, where he described the film thusly: There are new cultures and settings and creatures, and new biomes. You will see a lot more of Pandora, the planet, that you’ve never seen before. The new film is not what you expect, but it’s definitely what you want. Obviously, the title sets up a very different setting than the second Avatar, which was The Way of Water. READ MORE: James Cameron Has Ideas for Avatar 6 and 7 The Way of Water finally opened in theaters i…