I think you may have failed your saving throwThere is not a single new monster in the Creature Catalog. Not one. In other words, there was no creative growth in the monster department whatsoever.

In my book that's a good thing. I wouldn't have wanted to see a new monster take up the space of an old favorite. Put new monsters in the regular monster manuals, please. The Dark Sun Creature catalogue is for Dark Sun monsters. And it can't be a Dark Sun monster if it's a new monster!
I don't think I've seen new monsters in the Eberron Campaign Guide either (Can't talk about the FRCG, since I don't have it). And to be honest: I'm missing quite a few favorite Eberron creations.
Now, several setting-specific (Dark Sun or Eberron) monsters have become part of mainstream and thus have appeared in regular monster manuals, but that is something I don't like a lot.
The monsters tend to lose what made them special by ripping them out of their roles in setting. At the very least such monsters should include a sidebar telling about their place in their origin setting.
E.g. in 3e several Dark Sun monsters were released in MM2 and several monsters obviously created specifically for the Eberron setting in MM3. At least MM3 had sections describing how to use the monsters in the most important settings, but you still couldn't tell about their true origins.
P.S.: I just noticed I'm completely getting off-topic here, so:
Nope, Mr. Dancey wasn't right, so far. Or rather, his predictions are about as right as a typical random prediction by Nostradamus.