Yen Press has released a picture of the cover of their version of the first novel. They aren't going with the original cover art. Instead it's new art with a completely new design for Horo / Holo. Their news page announcing the cover art explains why they redid the cover art. Basically they feel that the new art will be more appealing to the general audience than the original manga-style art. For lovers of the original art, they will include a slip jacket featuring the original art in the December issue of Yen Plus (their monthly manga magazine). Picture of the new cover design can be seen
here.