Details are scarce as to the plot of the new 'Transformers' movie.  I'll break down what I can based off the trailer.First it looks like this movie takes place years after the other movies.

Mark Wahlberg plays a father that unwittingly finds Optimus Prime.

The transformers are no longer welcome on Earth and are in hiding.

Dinobots (dinosaur transformers) have re-emerged on Earth

 

You can check out the trailer yourself and see if you can glean any more information from it.

'Transformers: Age of Extinction' Trailer