Okay, Vladimir is going to get a legendary skin. You can find his teaser here. In the url of the teaser it clearly states legendary skin.
His splash art.
His ingame skin. Might be something wrong with his cape though. It is not sure if this is the official or final skin.
His new voice sounds.
It's called Blood Lord Vladimir, but this has not been confirmed.
Edit: The trailer for Blood Lord Vladimir has just come out. You can find it here.