The concept art for each of these two was months ago, and we finally get their prototype sculpts! Celestia and Luna are designed to look good together as a set, though they come independent if you only want one. This also follows the reveal of Sunset Shimmer's final model and preorder last month.
Only Luna's pony counterpart has been dropped so far, but the screencap notes that she's still in the works so expect her soon.
Celestia: