Here's a great post I came across, listing the 5 Laws of Cloud Integration according to Shawn Rogers:

• Data is widely distributed
• Everything happens fast
• Control is distributed
• Connectivity becomes more challenging
• Data volumes increase at explosive rate

Here’s the counter:

1. Data from Cloud applications must be integrated with other systems to deliver maximum value.
2. Cloud integration services must be easy to use for non-technical users.
3. Cloud integration services must provide strong IT governance and control.
4. Cloud integration services must provide broad end point support (apps, databases, files, etc.  - both on-premises and cloud).
5. Cloud integration services must be able to handle large data volumes.