While Adam yesterday (rightfully) pointed out the necessity of the occasional Star Trek reference in this feature, he failed to point out its natural outgrowth. While there is always Q Continuum, there must also be the Son of Q. He goes by q, in the lower case. That leads to some funny sounding dialogue like "I will always be your soulmate, little-case-q." Or something more awkward like "I am the great and powerful little-case-q." But that's okay. For the continuum, it's all third person references. Which leads me to . . .
Transit asked . . .
"At he beginning of Forge of Souls (Horde version) Lady Sylvanas says; "The Dark Lady watches over you. Make haste!"
Who is the Dark Lady?
She could be talking about herself in the 3rd person, but I don't think so. It seems she is talking about a particular entity. I also noticed the "Dark Lady" in the phrase is capitalized, which I think is also significant."
I had actually wondered the same thing, once. I briefly believed that maybe this was some kind of generic dialogue, and maybe Blizzard didn't update it to be spoken by Sylvanas. Now, however, I have learned the error of my ways.
Sylvanas is The Dark Lady. She's just referring to herself in third person, as you pointed out. It might seem a little up-on-herself, but it's more that she's being regal and queenly. Imagine King Wrynn urging Alliance soldiers forward, shouting at them "Go! Your King commands it!" You wouldn't think anything particularly odd about that phrase. In this case, it just looks a little funny because The Dark Lady isn't a title we're accustomed to seeing elsewhere.