There are probably no dragons currently active in this storyline, at least for the moment. The Blue is still asleep at the bottom of the ocean in Arcadia, Green (McAllen) and Red (Cortez) are presumably dead or at least waiting until they revive. And something happened to the White at the end of Dreamfall which took her out of the picture, at least for the time being. But it is interesting that that company in Casablanca which Zoe infiltrates in Dreamfall has a red dragon sigil as a brand motif or something. So there's definitely something going on there.
Actually, IIRC, the White told us that the Blue has been killed. In Dreamfall, I remember her telling April that something was killing off dragons, and that when the Blue was killed, the White went into hiding. After April left, the White was attacked by something. The most prevalent theory, at the time at least, was that Brian Westhouse was the attacker--or rather, the Undreaming that is apparently inside him. The White's appearance in Book One as a ghost would seem to indicate that she was, in fact, killed.
I never noticed Waticorp using a red dragon as a brand. THAT's extremely interesting. Does anyone else remember this? If it's true, it would seem to connect Cortez to Waticorp in some way--which would be odd, given that Cortez has definitely been painted as a good character and Wati has definitely been presented as evil.
Another symbol that this drew my attention to: it's probably been mentioned before, but I just remembered that the symbol of Hanna's gang is the dragonfly, and that Queenie is seen making some kind of artificial dragonfly sculpture (or robot or something) in her lap. It seems likely that Hanna got the symbol from Queenie, and her association with the symbol (a DRAGON-fly) is further evidence of the theory going around that Queenie is one of the Kin. I think that's the camp I'm in, now--the "Queenie is a Kin" camp.
All of this is, of course, way off-topic--but I'm okay with that if you folks are