"Early teaser" refers to a short preview or preview material released in advance to generate interest and excitement for something that is to come later on. Full definition
Check out a very early teaser for the game below. (darkainarts.com)
Early teaser trailers used the film's unusual setting to bamboozle audiences into thinking that District 9 was an allegory for the failures of post-Apartheid South Africa, with added flashes of digitised carnage. (lwlies.com)
In these latest photos the prototype features a large fixed rear wing, but in earlier teasers the GT 4 - door featured a retractable rear wing. (thetorquereport.com)