From the GP support team, R2 isn’t out yet but it’s still time to think about Upgrade Planning for R2: Let’s Get Started! – Dynamics GP Support and Services Blog – Microsoft Dynamics GP – Microsoft Dynamics Community.
Upgrade Planning for R2: Let’s Get Started! – Dynamics GP Support and Services Blog
Microsoft & the GP EcosystemInstall, Upgrade & Admin
Archived post from 2014. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.