I doubt it is in response to complaints about a lack of communication from National about the Jamboree on various unofficial Jamboree email lists, however there is now a national email newsletter for Jamboree participants and staff.
According to BSAJamboree.org beginning in January and continuing through July, the Jamboree Navigator will be delivered to each Scout, Troop Leader, and Jamboree Staff member who signs up to recieve this email newsletter. The monthly newsletter will feature information about programming opportunities, the arena shows, and how to prepare for the 2010 National Scout Jamboree.
According to the thank you page this is a service provided by the Order of the Arrow.
Check out the Newsletter Signup page on BSAJamboree.org for additional information and to sign up for these monthly newsletters.