The last week of June marks a few “anniversary” events for Transformers film franchise that indicates a teaser trailer for Transformers 2 could be coming.
June 29th, 2006 – Rover on Mars teaser trailer released
June 21st, 2007 – world premiere of Transformers 1 in Italy, followed a week later by its theatrical release for the public.
June 27th, 2008 – ?
June 26th, 2009 – Release date of Transformers 2
Just from that pattern, it seems to me that June 26th, 2008 would be a perfect time to release a teaser trailer online and then the next day in theatres with Wall-E and Wanted. Sure they are not Paramount films but both are expected to have huge audiences so why not use them.
This is all just speculation on my part but its seems to me that if Bay isn’t thinking teaser trailer maybe a producer or two should start whispering into his ear about it, if no other reasons then to keep the June streak alive and start generating that buzz for those not already aware that a sequel is coming.
Source: Transformers Live