Found on Blizzard's site, taken down. Created by current D3 art director, John Mueller. Male/Female repping, as with all classes. All kind's of legitness here.
Of course, it's possible he just wanted to doodle some necros, for like... fun.
Feel free to tell me it's bullshit, I know I've done the same hahahaaaaaaaaaaahhh!!!!
The webpage where it no longer exists: here
Here is some more fuel for the speculation fires:
http://www.mtv.com/news/2457456/diablo-iii-necromancer/ An old interview with Jay Wilson back before Diablo 3 was released.
"We are trying to design the Witch Doctor class so that if we did bring back the Necromancer, there's room for him. We're looking out ahead of time at what our expansions are going to be, so we've got to keep room open for some of those other classes down the road."
I misquoted Jay in this thread somewhere. Credit to a cool dude on Diablofans for digging this nugget up.