It's just what you expect in the trailer. The movie is pretty much just a long trailer with no character development or an actually interesting story. The characters being animals has no affect to the plot, they could have been anything and the movie would still be the same.
The movie is lazy, uninteresting, and boring in many places. The character designers have done a terrible job. You're suppose to know what a character is like just by looking at them and you can only do that with one character (the elephant) and even then all it tells you is she's shy.
You might as well just go home and watch something like X factor because thas what your wathing when you see the movie.
The movie feels cheap at times, using the same character models over and over again for the backgrounds characters and not even bothering to change the colour pallet to make them look a bit more unique. If you want to watch a movie about animals then watch ANY Disney or Dreamworks or Pixar movie. Those companies make watching their movies worth while. They use the character designs to express the characters and let you know what they are like.
All in all Sing is a mediocre movie that isn't worth your while.