For those collecting badges and following the lore posted up on the My Little Pony website for each location, the Crystal Empire has now been listed, complete with bios of the ponies in residence, videos clips, and reviews from both Pinkie Pie and Twilight Sparkle. Turns out neither of them thought the place was perfect, but they loved it regardless. Maybe that has something to do with the world shattering events they always run into when visiting the place.
Check it out at the Explore Equestria website.
Thanks to Feather Data for sending it.