(From the press release)

PLoS ONE will be an open public venue for all rigorous scientific research from every discipline. Users will be able to share their views on the papers with the community through annotations and discussion threads, adding value to published material and creating powerful new ways for other readers to navigate and understand the literature.

Papers published by PLoS ONE will be held to rigorous standards of scientific quality. However, subjective considerations like "likely impact," "degree of advance," or "interest to a general reader" will not play a role in deciding whether an article should be published or not. Instead, published papers will be exposed to peer review in its fullest sense. All readers will have the tools to add comments, annotations, and ratings to each article, so that post-publication review forms an integral part of the review process. PLoS ONE will empower the scientific community as a whole to engage in an open discussion on every piece of published work, capturing the varied and extremely valuable assessment of published papers that occurs after the work has been published.

With PLoS ONE, papers need no longer be static markers in an ongoing process of scientific discovery, but the beginning of a conversation between authors and readers alike. Authors looking back on papers written 6 months or a year ago may see things that they would have written differently; new data may have arisen to strengthen or alter some of the conclusions. PLoS ONE will provide authors with opportunities to make those changes and so acknowledge the evolution of their ideas. This will not alter the scientific record--the original paper is still the original paper--but authors and readers can build upon it. And anyone with an interest can read and benefit from this.
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For more information on PLoS One you can go to http://www.plosone.org/. The site has not officially launched. You can surf around and look at some the information about PLoS One. You can also sign up for news and updates on the progress of the PLoS ONE project.

What interests me a lot is this sentence in the press release, "All readers will have the tools to add comments, annotations, and ratings to each article, so that post-publication review forms an integral part of the review process." Does that sound like a wiki to you?! I can not find any specific information on who makes the comments (other than readers), it sounds as if anybody can "add to the article" by making comments. The website information pretty much says the same thing. Unfortunately, since it hasn't officially launched I can't poke around it, lift the hood, and kick the tires. I am very curious to see how it works and if it is a type of a scientific wiki. If it is, then we as librarians and researchers will be forced to think of wikis as something more than just Wikipedia.