Writers Roberto Orci and Alex Kurtzman originally passed on the sequel because of a busy schedule. The studio began courting other writers in May 2007, but as they were unimpressed with their pitches, they convinced Orci and Kurtzman to return. The studio also signed on Ehren Kruger, as he impressed Bay and Hasbro president Brian Goldner with his knowledge of the Transformers mythology, and because he was friends with Orci and Kurtzman. The writing trio were paid $8 million. Screenwriting was interrupted by the 2007–2008 Writers Guild of America strike, but to avoid production delays the writers spent two weeks writing a treatment, which they handed in the night before the strike began, and Bay expanded the outline into a sixty-page scriptment, fleshing out the action, adding more jokes, as well as selecting the majority of new characters.The three writers spent four months finishing the screenplay while "locked" in two hotel rooms by Bay: Kruger wrote in his own room and the trio would check on each others' work twice a day.

taken from wikipedia

Told ya not to open it lol