Renowned horror manga author Junji Ito (Gyo, Uzumaki, Tomie) has no shortage of excellent works to adapt into anime, but other than Gyo his stories have primarily served as inspiration for live-action projects. That's about to change according to Asahi Shimbun's Junji Ito's Haunted House site, which revealed that his manga is set to make the leap to anime.
The picture on the site doesn't just focus on one of Ito's works, and includes imagery from Tomie and Slug Girl, among others. With that in mind, maybe it will be an anthology rather than a single work, which would be amazing.
This news is nicely timed with Ito's 30th anniversary as a mangaka. His most recent work to arrive in English can be found in Viz Media's release of Dissolving Classroom and the hardcover Fragments of Horror, both of which come highly recommended. There's also a newer collection of Tomie, and you can pick up Junji Ito's Cat Diary: Yon & Mu from Kodansha Comics.
As for the anime adaptation, more info will be revealed later.