The Sigmarites got some new mini-dragon riders lately. Now the older, bigger, and possibly meaner larger siblings of those mini-dragons have gone up for pre-order over in the Games Workshop webstore.
You can either get your dragon alone or in a group of three. As you'd expect, you can create a couple different models with the parts included. Sure, there's a couple different pieces for the dragon, so you don't have to worry about the two of them looking totally alike, but you can also make two different riders. He can either be a Drakesworn Templar or a Lord-Celestant on Stardrake.