Bleh doesn't give anyone a hint of what the movie is really about. The picture they showed at ShoWest was a better teaser than the trailer.
Woody has his back to us, overlooking Andy’s room. Woody’s head hangs low. Andy’s room is now a teenager’s. There’s a hill of dirty clothes in the middle of the room, a guitar in one corner, car posters on the wall, etc. No toys to be seen except for Woody himself.
Also do not go to the Toy Story 3 page on Wikipedia. The ending is spoiled on it.