I stole this link from cheeka, and i'm posting it here for everyone to take a look at. Keep in mind that this instance may not be released for another month or so, but it's still good to get an idea of what to expect out of the instance.
I'm sure there will be updates and changes so i'll post some new links when that happens.
I love troll themed too. ZG was the best instance in game =) I havn't had the chance to do PTR runs though >< So I'll prolly wait around till the patch but it definitely is in the plans for our raids. IMO the gear you get from there and new heroics is NEEDED for maggy and will make gruul much smoother. (hence it being better than kara imo)