Perhaps it's going to do what the FR DM's guide book is going to do - have deep dives into select regions (domains in this case) to help the DM flesh out those areas and give suggestions on running the types of horror those domains represent. Lamordia could well be one of those. Basically, the Ravenloft campaign guide would still be there for an overview of the setting, while this book gets into detail of certain interesting areas (which is how the two FR books later this year look to be). One question would be whether they think Barovia would need extra coverage, or if Curse of Strahd is already detailed enough.