No surprise to anyone by now: Wizards of the Coast has started another round of Christmas layoffs. This year, so far, Rob Heinsoo (D&D 4e Lead Designer), Logan Bonner (Adventurer's Vault), Chris Sims (4e Monster Manual and Dungeon Master's Guide) and Stephen Radney-McFarland have been cut.
Numerous sources have already broken the news. The most informative links are below.
http://www.enworld.org/forum/general-rpg-discussion/268912-wizards-coast-layoffs-rob-heinsoo-logan-bonner-chris-sims-2.html
http://nitessine.wordpress.com/2009/12/07/merry-christmas-wotcs-annual-layoffs-rpg-superstar-2010/
We covered the 2008 layoffs in this story - exactly 100 stories ago, and about exactly a year ago. Clockwork.