I didn't click on the link to read that but here are other factors:
1. Bay said the new script is awesome
2. He indicated more scenes with just Transformers, including accents on their faces and emotions than before.
3. Arcee will be in the movie
4.) I heard Jetfire will be activated by Sam using the piece of the Allspark recovered by Prime at the end of the first film. I guess he will understand that he is more an Autobot than decepticon.
4) Shia's recent hand injury from his accident (his hand was severely crushed) may be worked into the script.
5) While it's possible that other characters will take on diff. forms, Prime will eb the same. Jazz and Megs may return.
6) Wheeljack may be in the film.