Cloud and on-premise integration strategy

Until recently people in IT has been debating about various integration patterns. And EAI, AIA, WS, ESB, MOM based solutions largely solves the integration comes under:
1. Process modeling based
2. Data model based

To be on premise or cloud is new dimension. Architects, CIO etc are defining over all strategy for Cloud and on-premise, integration is missed out or only discussed at the level of feasibility(Cloud and on-premise integration). In addition there are various aspects(refer list below) which has to be considered, probably there has to be strategy for integration:).

1. Integration on-premise or cloud: Which integration should be in cloud and on-premise, how cloud and on-premise has to be integrated
2. Deployment: Where to host integration solution
3. Best practices
4. Integration cost: Every new integration adds to cost??
5. Code Portability: Same services in cloud and on-premise
6. Cloud integration skills
7. Design complexity
8. Scalability and high volume of data
9. Routing data from Cloud to On-premise or Cloud
10. Parallel processing, for Cloud to multiple targets (On-premise and/or Cloud)
11. Transformation and enrichment, when data model is not same for Cloud and target system and finaly
12. Fault tolerence