Have you noticed, that this DLC will be released BEFORE the Frontier Expo??? What should they show at the Expo show, if they release now an larger Expansion Pack with dfferent themes. For PC are 3 new DLC slots reserved in the Data Base, one is now reserved for the Spooky Pack, so two slots are still open for upcoming things ... we should wait 'til the Frontier Expo is over.
The devil's advocate in me supspects that Frontier's gonna hint at some sort of sequel or standalone spinoff at the Expo; As I feel that many of the game's current flaws and shortcomings are a result of deeper design decisions that cannot be fixed without a complete do-over. That would, however, mark the current game and any paid expansions end-of-life, and if they would have announced the sequel and this DLC at once, people will think twice before investing any further in the current game. So it's better to release the DLC a few weeks earlier and be so vague about it's actual content that a major part of the community will buy it out of curiosity or blind faith. Too cynical? I bloody hope so.