Player's Handbook 2 Update PDF
Open Grave Update PDF
Barely a couple weeks old and there's already an errata for the Player's Handbook 2. Although the changes are on the 2 controversial expertise feats but they are very minor additions to prevent it from giving stacking bonuses for weapons/implements that belong to more than one group.
The update for Open Grave is just detailing the Zombie Plague for the infected zombie template.
You can find these updates at the links above or from the Official D&D Updates page.