Poster Gurluas over at the MMO-Champion member forums uncovered an interesting skin within the files of the updated PTR. As he states, they resemble a female Blood Elf with red eyes and gear that closely matches those worn by Lady Sylvanas Windrunner, the leader of the Horde's Forsaken.
Currently, Sylvanas is modeled using the Night Elf skin, which according to WoW lore, is a very inaccurate portrayal of the Banshee Queen. This "new" skin (and I can only hope that's what it is), however, would better depict Sylvanas's history as a High Elf, a race that eventually took on the name of "Blood Elf" in honor of their fallen brethren - a pretty sweet story imho.
Here's to hoping we see this skin on the Live realms soon, and as Sylvanas for sure! And a big thanks to Gurluas for uncovering it. Good work!