It's been out for a while now. They seemed to quietly release in the dark with no advertisement once so ever because even finding evidence that the server exists is difficult. I couldn't find the site until I logged in using the saved realmlist line from last time. I then saw the URL mentioned in a system message. If you want to try it:
https://www.vengeancewow.com/set realmlist vengeanceWoW.com
They since added a system message about voting, which I guess they are hoping make people actually discover the server. Perhaps that is what grew them from 2 players from my last visit to 20 now. When you log in, expect to immediately be messaged or invited to join the single guild for your faction. The way this server released seems stupid to me, the exact opposite of the way Nostalrius is going. Nostalrius intends to build up a nice following so it actually releases to an acceptable population that will attract new players. Ghost towns just turn most people away, preventing growth. Vengeance seems to have shot itself in the foot, and I don't know why. They could have been building up this server with advertisements or videos long before release, but instead sat on it, told no one, then quietly released to empty air. There are plenty of private servers that did this, releasing to the open air with little to no players actually on it.
The site brags about them being original private server developers but they don't make any attempts to prove this, showcase anything scripted for the server, or have videos showing anything for the server's benefit at all. This is odd, as I wonder why/how they expect people to believe anything they say. You basically have to just take their word for it, sign up and try the server, and find out. They don't even seem to have a forum now, although to clarify, I'm not sure they ever did. Last time I went to the site, there was a forum link that didn't go anywhere. I don't know if there was ever once functioning, or if it was just a dummy link that was removed. Ping is nice and low, coming from Canada, but if Nostalrius turns out to be better scripted, I don't think this server will have much of a future.
This is all just my observation, apparently a follow up of the one I made on the Corecraft thread about this same server a while ago. I was posting there before I came here, and it too had a thread about Vengeance. I don't know anything else about the server, try it if you like. Hopefully someone else will be willing to level on the server, test a lot of things, and share what they find out.