Our paper refuting the original claims won't appear in Science until late July, and Science's embargo policy asks authors to refrain from contacting the press. Reporters on Science's list will be sent copies of the paper a week before it is published, on the understanding that they will not report on this information until it appears in Science.
From the info sheet Science sends to authors:
The embargo policy ensures that no single reporter or news organization gains an advantage over others and that reporters have an equal amount of time to write full and accurate stories. Your cooperation with this policy helps us gain excellent coverage for your research and protects you from problems that may jeopardize your paper’s publication.(Ooh! "...problems that may jeopardize your paper's publication"!)
Science asks authors to not initiate contact with the press about their publication, and to only talk to members of the press who have agreed to respect the embargo. Authors are free to present their data at conferences, but are asked to inform Science of this in advance.
All this seems a bit silly when applied to research results that have already been widely publicized, with the manuscript publicly available on the arXiv server (it's also on PubMed Central but not released yet). So I emailed Science for clarification. The response asked for what seem to be slightly tighter restrictions (to not mention that the paper is in press at Science, to not talk to the press after my presentation). These seem inappropriate, since this is a public-outreach talk and since a major focus of my presentation will be on how science is communicated.
My plan is describe the refutation results and the Science paper as a minor part of my talk, and to meet with whatever press the organizers arrange, either before or after my talk. I'll make sure the journalists are aware of Science's embargo, but I'll happily talk with them about any aspect of the #arseniclife debacle. I'll probably also mention the issues surrounding the embargo in my talk.
If you'd like to learn more about embargos in science journalism, I recommend Ivan Oransky's excellent Embargo Watch blog.