I'm going to go against the seemly popular opinion here.
I enjoyed the trailer. I love the idea that John Hammonds vision is realised and on a scale far beyond the 'little park' he wanted
If you look at the history of corporate greed and the huberus of Man we/they have always wanted more, pushed the limits with little regard for the consequence and then **** happens. If Jurassic World were real it is totally believable that corporate types would push for the man playing God creating bigger and better attractions and obviously it will go wrong... The plot does hold water with the way of the world.
I am a little less happy with the CG heavy load as opposed to the model driven 90's work but this is a trailer 7 months before the main course, plenty of time to clean it up a little.
As for the content, come on, a Dino so big and bad it snacks on great white sharks, that's fun, the raptor/bike thing is different, especially as we are led to beleive the raptors have some relationship with the character. again read up on scientific studies where relationships between humans and animals have been formed over long periods of time, stretching the limits a bit but not entirely impossible.
The final clincher is the wonderfully singled toned rendion of the JP score at the end of the clip, the soft music against the carnage on screen is a great foil.
Don't be so quick to jump on the hater band wagon, this film looks fun, slightly silly and packed with action, what more do you want from a summer block buster type?
Also it was San Diago in JP2 where the T-Rex ran wild, and come on, tell me the scene where he eats the dog or where the giant eight ball rolls down the street aren't entertaining.