I didn't see those NPCs specifically, but I've noticed a couple new blood elves around horde areas, specifically one near Splintertree Post, near the watch tower before the gates, and one in Tarren Mill, near that banshee outside the old church. Neither one actually has any quests, but I'm betting they're for BE rep once the patch hits...
crossingredsea wrote:
However, when I went back 2 days later, he's gone!
My hunch is the guy wasn't supposed to be there yet, so it was a glitch. I'd abandon the quest myself, and look for it again once the expansion hits...