That was what I was looking for! Thanks!
Cover is shown in this video.
Actual Lore about Dragonborn, and the recently tested new Dragonborn stats. Draconic Feats & spells, and a revamped take on Kobolds, from the same UA. All of the Dragon's from throughout the games history in a Bestiary. Best guess is that this will be like Volo's Guide, but "Oops! All Dragons."So, Gem dragons, the dragon PC UA, more dragons obviously. But what else do we think could be in this book?