I must admit I am confused by the title of this movie. In the first promotional material for the movie it was translated 'Big Soldier'. In this trailer it still quite clearly says 'Big Soldier' and yet on many sites it says 'Little Big Soldier' including jackiechan.com as well as on the official poster for the movie. Whatever it is called in English it is still 《大兵小将》 in Chinese.
Anyway I found this trailer which is newly released and uploaded it here for you to enjoy. Oh this movie is looking so good!
I absolutely love the antique parchment/Chinese painting feel to the opening sequence. I must admit to being REALLY excited about this movie!