We all knew this would be the first reaction - I hate to do this - but I can`t answer this question directly.
Hope bellow works for an answer:
Lets put it this way - Dragons are not official confirmed as a playable race.
So - we don`t guarantee Dragons will be in the game as a playable function anymore.
But if they are not in at the release, they`ll be in after - be at as a content booster or mini-expansion. But hey - Dragons might make it in after all - you never know. And if not - well you`d still get to "hire" dragons playing as other races.