An update for Office Web Apps Server was released on March 5th. You can find details on what's included in the March update and where to get it from here:
Description of the Office Web Apps Server 2013 hotfix package (Wacserver-x-none.msp): March 5, 2013
The March update also includes the changes described in the February 2013 update KB: http://support.microsoft.com/kb/2767967. The February 2013 update was only available temporarily. To get those changes, you must apply the March update.
How do you apply updates to Office Web Apps Server? Glad you asked! We published this article just for that purpose:
Apply software updates to Office Web Apps Server
Happy patching!