Glancing at the official global release date site (also on top left column), good news for the United Kingdom and Japan as they are getting Transformers 2 earlier than the rest of us. Now the release date for the UK is June 19th and for Japan it is June 20th.
This may be a result of the planned premiere parties in each country. The world premiere of the movie is on June 8th in Tokyo, Japan and the UK's premiere party is for June 15th in London. The United States premiere has not yet been announced.