I do not recall ever seeing a 5+ minute trailer ever and still think there is more left for the movie to show. Normally in just under 2 minutes you get to see everything. Cloud Atlas movie is an adaptation of the popular novel by British writer David Mitchell and it was well received.
This movie stars Tom Hanks, Halle Berry and others placed in different timelines, past, present, future and each by judging by the trailer look as polished as a stand-alone movie. The story is all about a chain reaction, how the actions of different people reflect generations to come and the trailer for sure looks confusing.
Created from the same guys who brought us the Matrix trilogy, directed by Lana Wachowski, Tom Tykwer and Andy Wachowski. I find this movie very promising and confusing, it will come out late October in the US.