The cover of volume 11 of Type-Moon Ace, a mook ("magazine-book") published by Kadokawa dedicated to all things Type-Moon and Fate-related, is teasing a "major announcement" coming soon regarding the spin-off light novel series Fate/Apocrypha.
Fate/Apocrypha is a series of light novels set in an alternate timeline to Fate/stay night written by Yūichirō Higashide and illustrated by Ototsugu Konoe. Five volumes of Fate/Apocrypha were published from 2012 - 2014. Already fans are speculating that the "major announcement" may involve a drama CD or an anime adaptation, although I think "pachinko machine" is another distinct possibility.
More information will be made available on April 15, 2016, when volume 11 of Type-Moon Ace goes on sale in Japan.
Paul Chapman is the host of The Greatest Movie EVER! Podcast and GME! Anime Fun Time.