UPDATE: We reached out to 612 for a statement and were provided with the following:
Yes, we are using the Nightshade game engine from Free Reign Entertainment. However, 612 Games is neither a subsidiary of Free Reign, nor financed by Free Reign or Sergey Titov. The team is focused on making a great game that will speak for itself, and now that we've addressed this topic we are going to return our focus to the game itself. Thank you for your continued support.
In a series of now-deleted Reddit posts, accusations were bandied about that War Z's Sergey Titov is somehow involved in 612 Games' Wild West Online. The controversy swirled around the fact that WWO is using the game engine developed and supported by Titov's Free Reign Entertainment. 612 responded with a firm "No" regarding the controversial developer's presence working on the game.
The first salvo came via the Wild West Online forum.
No, Sergey Titov is not involved in the development of this game, but yes we use a game engine developed and supported by one of his companies.
Later, a more expansive explanation was given on the forum.
We’d like to address some concern that has been voiced regarding use of the Nightshade engine. We decided from the outset that we did not want to develop a new engine – our strengths lie in game and story design so we wanted to use an existing engine that would be suitable for an online, multiplayer game and allow us to scale over time. We chose Nightshade because it provides the best tools for our team in terms of building/scaling the game, and it has some robust anti-cheat features already embedded that would save us time and expense that we could then allocate towards feature development. We’re happy with our choice, and are working to bring you a fun game experience built atop this engine. This is the only post we will be making regarding this subject and we expect this will allay the concerns of certain members of our community. We now want to focus on the game and working with you guys to make something pretty badass for PC. We hope you guys will judge us on the outcome of the game and give us your support so that we can bring this to fruition.
Those are pretty definitive answers to the questions many users had. We'll keep you posted as the story develops.