Two possible innovations here; there is a sword-less alternative, so Limbic may bring back the melee monster we know from earlier incarnations of the series, and there is also the possibility of the vampire being of the female persuation.
The fans have been screaming their proverbial heads off, complaining that the Vampire design shown earlier was both silly and merely a re-hash of assets from Heroes VI. Taking the "advice" to heart, the Devs said they would see if it was possible to change the designs. They did, and apparently it was, so the fans should be happy to see their hard work (shouting at devs is such a strain on the throat, we know) pay off. Finally, then, you can all vote for your favoured design and get something proper into the coming Heroes VII game.
Oh, and there is also a vote on the Lich design. But who cares. Liches suck.