Jumping the gun for something like this is perfectly acceptable in my book. Better to be prepared for the screw-job blizz is doing to everyones specs than not. Now if you'll excuse me, i need to go look at the armory to see what i can get to be hit capped again after the loss of the Precision talent.
The Devilsaurs dont keep their original size. They ARE noticeably bigger then other pets, but not as huge as they should be. So instead of being massively awesome, they are instead just one more thing that will block your tanks view during a boss fight.
Of course, they still have the whole 'stomp' sound effect as they move to sneak up on you, so you might get some kicks out of that. Terrifying vanilla-wow players with a core-hound is probably more amusing, though.