This finally arrived in the mail today.
It is a 25cm x 25cm artbook with 192 pages full of mashifoni illustrations that were found on posters, phonecards, dakimakuras etc. , the game cg and sd cg , a short discription of every route (including Sana and Yutsuki) and staff commentary.
Although none of the illustrations were "new", it still is a nice book to have for a collector like me.
Also at the end of the book there was 1 promo image for "Koi ga Saku Koro Sakura Doki", but other than that single image there was nothing more about it.