I think the new cloud killer apps for enterprises will leverage cloud-integrated data centers (or true hybrid cloud adoption), and will strategically transform IT operating models. Those killer apps will include cloud-enabled agility, protection and scalability.
The public cloud has been promoted as a low cost alternative to physical data center infrastructure, mostly to small and medium-sized businesses. That has driven the creation of a robust category of cloud migration services which has emerged as these smaller businesses have made considerable investments in moving their apps from colocation and data center environments into public clouds.
Enterprises, however, have been notably slower to invest in public cloud and cloud migration, at least in proportion to their overall IT budgets. There are many reasons for the slower enterprise adoption of public loud (IaaS) and they have been discussed extensively. I think what is missing is a more robust discussion of the next killer apps for the cloud; the enterprise game changers.