[wflynny]

Here is Nature's policy on embargo: http://www.nature.com/nature/authors/policy/embargo.html

They argue that

> [the] embargo serves scientists, journalists and the public. Our policy is to release information about our content in a way that provides fair and equal access to the media, allowing them to provide informed comment based on the paper that is to be published. Authors and their institutions' press offices are able then to interact with the media in a well-ordered fashion ahead of publication, and benefit from the subsequent coverage.