OK, back to editing. (I’ll try to update this post with any advance information as it becomes available.)
Update (on timing, not content): the main Planck press conference will be held on the morning of 21 March at 10am CET at ESA HQ in Paris. There will be a simultaneous UK event (9am GMT) held at the Royal Astronomical Society in London, where the Paris event will be streamed, followed by a local Q&A session. (There will also be a more technical afternoon session in Paris.)
Probably more important for my astrophysics colleagues: the Planck papers will be posted on the ESA website at noon on the 21st, after the press event, and will appear on the ArXiV the following day, 22 March. Be sure to set aside some time next weekend!