Dragons are a touchy subject, yes it is part of the marketing strategy to reveal little about the 2 things we are doing uniquely in the game, which are Dragons and MMO. The other part is as Tyranic suggested, Dragons aren't finished yet.
Humans, Elves and Orcs are all playable in our current build, so all the concepts we have envisioned for them are in play and we can see that they are working and we are tweaking what doesn't. Dragons aren't playable in our build, so we could go on and on about what we plan to do with them but it would be all speculation and such until we actually try these aspects out to see if they work in the game. So we choose to not give out information that we are unsure of.