Is there more concept art of Tiamat herself? I remember that being hinted atFor those of you still on DDB, Tyranny of Dragons is up ... and it looks like if you already owned Hoard and Rise, you get the combined Tyranny for free. I did not purchase Tyranny but I can access the whole thing, including the concept art ... speaking of which, this section is a lot chunkier than the corresponding sections in other books has been. Lots of cool concept art for the various dragon cultist robes and regalia. Even some of the minor characters like Remi Haventree get art in there. Also some cool comic book-looking pieces showing dragons and cultists attacking various places like Luskan and Neverwinter.
The cover art is interesting. It appears to depict Tiamat turning people into gold statues via a magic orb she is clutching in her claws -- not something that actually happens in the adventure, but it's a very cool visual!