When Will Transformers 3 Teaser Or Full Trailer Be Out?

Im in love with transformers and pretty much no everything about it but i cant find a source online to tell me when the trailer will come out for the new 3rd film. Just wondering if anyone has heard anything from good sources. Thanks for you help.When Will Transformers 3 Teaser Or Full Trailer Be Out?With the movie opening on July 1, 2011 my best guess would be expect a teaser in August or September. Don't expect a full trailer til Late December / Early January though