Not sure if you've read older posts, but way back in September of 2010 I had said that the ZG mounts would be making a comeback. I couldn't find any other posts to the contrary.. all of the news and WoW sites were all saying that the mounts were gone for good.
I had heard something else though. =]
Glad to see that everything I wrote about so long ago has finally come to fruition - the mounts, the Insane title, and the Qiraji Battle Tank available for more players and outside of the instance.
In regards to new Cataclysm realms, it appears that everything was all setup internally for new realm deployments too. But, the "Cataclysm experiment" failed to meet Blizzard's expectations and it looks like it has actually resulted in a reverse flow of subscriptions unfortunately. =[
This is good news for their next expansion pack however (or even content patches between now and then.) It means that they'll really have to do something awesome to bring players back. I'm hoping for a couple new Hero classes, a new crafting profession (create relics/wands/bows/fletching or elemental poisons for rogues), class-specific quests (like a Rogue's Den that issues daily assassination quests that require cunning), and/or maybe a third faction (with all brand new classes/races "from another dimension" to adjust the lore.) Paid class changes, larger backpack, more character slots, or progression servers might be interesting too.