Not actually a trailer. In the biz, they call those "sizzle reels". This one was released a few months ago to startlingly high acclaim, at which point every studio in the country took about 20 steps back and made a collective "wtf" face. Then those hardened elitist hollywood effeminate snobsauces softened their expressions and wandered closer.
Last I heard they were curiously jabbing at it with pointed sticks to see if it would run away when they got close...