Why is this important for fans of werewolves and shapeshifters? Well, I've posted about twice before, or just take a look at the trailer and see for yourself:
(See the trailer with this text link if the embedded trailer won't play.)
From the trailer, it looks as if the werewolf plotline is being given a lot of emphasis. There is no sign of the other shapeshifters (except for Hime herself, who is more of a pre-shapeshifter because she won't develop that power until she becomes an adult; but it would be a spoiler to say exactly what sort of creature she will grow up into if she survives long enough).
Overall, the OVA looks as if has higher-quality animation than the anime and will be more true to the manga's plotlines, though I do think that Hime looks a bit pointy-headed in the trailer.
Once it comes out, I'll see if I can view it and write another update.