As much as I find the idea of a trailer for a trailer ridiculous, I couldn't help watching it.
It's all calculated marketing to keep Prometheus in the blogs, forums, news From December until June.
I think the marketing departments know if they release a teaser they can build buzz and keep articles and blogs and their product they are hawking in the news, blogosphere, fan forums, and other forums such as their product's Facebook page buzzing with discussion and chatter. The old saying about there is no such thing as bad press.
Well if the first teaser trailer was leaked in December (6 months before the release)
2 video previews to the trailer
December 22, 2011
The Official High-Quality Prometheus Trailer released on iTunes
Jan.5, & 14
official promotional still photos released
1 per day
January 22, 2012
International Prometheus Poster
March 12, 2012
Preview of the Trailer Video
Saturday March 17th
official movie trailer release date
The film is released in Europe in a handful of countries on May 30 & May 31, June 1
June 7 & June 8 and oddly months later in these markets:
Germany 9 August 2012
Switzerland 9 August 2012 (German speaking region)
Spain 10 August 2012
Italy 14 September 2012
You can expect a late September Blu-ray release date.