Board Thread:Questions and Answers/@comment-73.53.50.157-20141128172532/@comment-216.232.195.113-20141129002937

There would have to be some changes made to the code. For example, a dragon would need to breathe fire, and the block-breaking effect of the Ender-dragon would need to be toned down a little (otherwise you would see whole mountains being destroyed in seconds). However, I don't think dragons need to be added until we have major quests, which won't be for a while.