In a recent interview by IESB.net with Transformers 2 producer Producer Lorenzo di Bonaventura, he mentions that Transformers 2 production will start on 2nd June.

IESB: Can you give us a quick update on Transformers 2. Is it still planned for shooting in July of 08?

LDB: The second, June 2nd.

IESB: June 2nd?

LDB: Yep.

IESB: Is the story locked?

LDB: We’re nowhere because of the strike, we won’t know until we come back. We have a very fine outline and we know exactly where we want go with the movie but until this writers strike comes back, we’ll find out exactly where we are. Michael is completely on top of every detail. He’s designed a lot of great stuff already. He’s got a lot of great sequences imagined but you know, he needs some writers to work with before he’s ready to go, so I would say June 2nd is an unofficial start, it’s the target date we’d like to go for but, you know, we’ve got to get some writers to help us.