2) Shia LaBeouf has been dissing on a lot of his bad films recently (Revenge, Indiana Jones and the Kingdom of the Crystal Skull), especially Revenge, and claims that the third one will be much better. I respect LaBeouf as an actor and I think he is somewhat trustworthy.
3) The writers have said that they are going back to the original story and even into the past of the Transformers. Good choice. Research and knowledge of what you are making a movie about is always a good thing. I have watched several movies where the filmmakers didn't do their research and the movie become sorely unbelievable.
So, for those reasons, I have high hopes for the next film. I also heard that Roberto Orci and Alex Kurtzman have been left out of this film. Orci and Kurtzman worked on the first two films. Ehren Kruger was brought on as a writer for the second film and many people have blamed him for failure of Revenge. But I don't know. Seeing that Kruger does not have a good track record, this could be a really bad thing. Orci and Kurtzman's previous works includes Mission: Impossible III and the new Star Trek film, but they also are to credit for the ridiculous Legend of Zorro film and Xena: Warrior Princess series. So we'll have to see if Kruger will bring this trilogy back from the depths, or if he will destroy it completely. Transformers 3 is currently in production.
Meanwhile, I recommend checking out the film Inception. It's a good thing Christopher Nolan is around to keep us sane in the era of terrible movies.