A new Lego Ninjago Movie Polybag has been found, the Ice Tank, a miniature of the bigger standard size set (70616). The piece count is not known but looking to the picture, I would say that it will bring something around the fifty pieces.
The tiny little Tank, at the first glance, looks pretty nice with rubber tracks, a small technic structure in the back wheels, a blue transparent brick right at the back and of course a white and fearful front with a big gun.
This polybag, together with a few others (Kendo Lloyd, for instance) will be available next summer when the movie hits theatres.