The gentlemen of BigDownload have posted a video of Darkspore's editor stuff in action, which you can conveniently see below. As you are probably aware, this part of Darkspore is based on the creature creator technology developed for Spore, only the idea for Darkspore is that the things you create in terms of monster morphology have direct implications for your abilities in the game world. Go take a look for some more details.
Also, the trailer reveals that the game is arriving on March 29th, 2011. So not long to wait.