The "Off Season" sub-series of Monogatari light novels,written by Nisio Isin and illustrated by Vofan, wraps up with Musubimonogatari ("Binding Story"), out on January 12th with Senjougahara Hitagi on its cover. A slightly early look at this has revealed that 2017 will bring "Monster Season," starting with a book called Shinobumonogatari.
A Musubimonogatari teaser-Tweet notes that it is set 5 years after earlier stories, when 23-year-old Araragi has become a police officer.
Teaser text for Shinobumonogatari says "What of the one who named the legendary oddity(ies) Araragi Koyomi confronts?" and "Do not overlook the blade-point, which has endured a long age of submission and gleams."
Thumbnail from Comiket 89 anime goods
via Grimdark Rose