User blog comment:Jimeee/Dragonborn DLC trailer released./@comment-3515798-20121105154312/@comment-5501398-20121105163453

from what i remember reading, the title dragon-born is associated with several groups or such.

1) dragon-borns like our character that were born with the blood and soul of a dragon

2) the decendents of Talos aka the septim blood-line

3) the morrowind character was also called dragon-born

so i believe that when they say "the first dragon-born" in the trailer they mean that he is the first mortal to be born with a dragons blood and soul.