In our busy lives, this one might have slipped by your Excellent Dynamics CRM Extension Team.
A new Microsoft Dynamics CRM SDK Update was released in June
To Read More From the Field, Check out these two great writeups ...
http://crmbusiness.wordpress.com/2013/06/19/crm-2011-new-sdk-version-5-0-16-available/
http://bingsoft.wordpress.com/2013/06/19/crm-2011-sdk-version-5-0-16-available/