David Estlund's new book, Democratic Authority (contents), is out today. There are several copies in Blackwells (in the political philosophy section) or you can currently pick it up with 34% off at Amazon.
Personally, I was hoping that I might be able to pick up a review copy (any offers?) but I'm very much looking forward to reading it over Christmas - even if it may be too late to engage with the arguments in my thesis.
Readers may also be interested to know that an online reading group has been mooted and is planned for Public Reason.