From Satya Nadella’s blog, Microsoft is adding new Snap Ins to their ERP and CRM apps and encouraging developers to create more. The first set is for CRM and DynamicsAX (Axapta) but I wouldn’t be surprised to see more coming for DynamicsGP.
The first four announced snap ins tie CRM and Axapta tighter to Office 2003 integration. You can read the whole article here.