Microsoft is clarifying their Microsoft Dynamics GP 2013 Extender Announcement. My comments on this were mostly speculation, and were identified that way. After review this, I’m sticking by my speculation.
Microsoft Dynamics GP 2013 Extender Announcement – Inside Microsoft Dynamics GP – Site Home – MSDN Blogs
Microsoft & the GP EcosystemDevelopment & IntegrationGP 2013
Archived post from 2012. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.