Dragons are a planned
mob.
Notch hinted during the
Spider Jockey update that he will add Dragons to the game.
[1] It is also mentioned that dragon lairs may be an addition.
[2] It is not known which version that Notch plans on adding them, and there has been no previous work that he has displayed to show that he is currently working on dragons at this moment, and remains a potential work-in-progress until future updates come. It also should be noted that one of
the random messages on the title screen is "Absolutely dragon free!". Notch has also stated that
achievements could lead into a large cumulative task "like killing a dragon." It is also possible that they could be the "scary monster"
[3] coming in the Beta 1.8 update, although this is slightly unlikely as _Jeb seems to advise against having dragons as was said at the dreamcast presentation, at the time 31:34.
[4]
References