Here's the quote from the blog:
With a title as cool as CSI -NY, we really wanted to something new and fresh. We looked at our favorite elements of the traditional adventure game and blended it with the best of the casual game genre to make a game unlike anyone has done, in either genre. We've remade and streamlined how you talk to characters, added a cool, refreshing graphic-novel art style, blended hidden object style gameplay with traditional evidence collection and concocted some really great games, puzzles and stories to transform the show you love into a immersive gameplay experience.
Reading this, I wouldn't have anticipated that the gameplay would take the game out of the adventure genre and put it squarely into the casual genre -- I would have expected gameplay to be like the previous CSI games, but with a few more casual-type minigames, perhaps.
There are examples of genre-fusing games, though more adventure-action than adventure-casual. And we are seeing casual games becoming more like adventures. I suppose it was inevitable that, sooner or later, an adventure series would become more like casual games.
There are games that seem (from the gamer's standpoint) to be marketed as adventures to the adventure-game-buying public, that then turn out to not be adventures -- usually they have a lot of action in them, rather than a lot of casual game elements. Penumbra Overture would fit in this category.
There are also games that seem to be marketed as action adventures that then turn out to fit fairly well into the adventure genre. Lost Via Domus for PC would be one of those.
I think that developers/publishers sometimes have a hard time accurately describing what a game is going to be like, particularly if it fuses genres. Though I suspect there IS some sense of wanting both the adventure gamers and the casual gamers to buy the game, so maybe a perfectly accurate description of every element of gameplay, not only would create spoilers, but also might prevent people from buying.