They provided fuel to the SS/NH fans by using Hinata and Sasuke as their poster children in RTN to compel them to watch the movie. Pierrot could very well be doing the reverse now by offering a stringed piece of meat to the emaciated NS fans.
My main issue is with the "timing", it doesn't make sense. Why hold a mere poster until the movie premiere if tons of information have already been released along with official merchandise such as Hinata's personal alarm clock?
Though I wouldn't be surprise if it was simply a consolation prize for fans who get disappointed with the movie.
You sad NS didn't become canon? Here, take a cookie poster .