Here is a high quality trailer:
http://www.apple.com/trailers/fox/hide_and_seek/
I like Dakota Fanning and Bobby De Niro.
I am hesitant about the premise since it is one that's been done before on "Twlight Zone" (kid has a real imaginary friend that may or may not be malevolent) and other TV shows and films...
So, I will reserve judgement once it is released and hope the execution is what stands out more than the storyline.