eOne has info on Release Dates for their products and how they coincide with GP2013 release dates. If you use Extender you’ll want to read this.
The eOne Dynamics GP and CRM Blog: Release Dates
Microsoft & the GP EcosystemGP 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.