On the 22nd of June, a domain was registered under the name ANATSU-ANIME.com. Given that Assassination Classroom is titled Anatsu Kyoshitsu in Japanese, this could very well be a sign that the manga could be getting an anime adaptation.
The series follows an unkillable extraterrestrial invading Earth an tasking a high school class to assassinate him within 1 year otherwise he will destroy the world. It is an unique series in the Weekly Shonen Jump line-up and has gained quite a following.
With an OVA pilot already having been released as Jump Festa last year, it gives added weight to the possibility of a full-fledged series. So could Assassination Classroom be in line for an anime adaptation? Probably.
UPDATE: The anime adaptation has been confirmed through a leak of next week’s Weekly Shonen Jump magazine. Thanks @newsmangajapon.