The NY Observer says that the Wall Street Journal has hired Robert Messenger–who has been at The Weekly Standard, The Atlantic, and the New York Sun–to run a new pull-out book review section set to appear in the newspaper’s weekend edition later this month. One source tells them it will carry a “significant” number of pages, but that’s all they for details. Current WSJ books editor Erich Eichman will report to Messenger. The book reviews will be inserted into a secret new section being edited by Gary Rosen, though Messenger reports to editorial page editor Paul Gigot.Observer