So many vendors have bastardized the definition of "cloud computing" to suit their own needs that the term is losing its meaning. SAP, however, has come up with a clever way to circumvent the confusion with a simple statement of how they approach cloud: The company provides APIs to data center resources so that its customers can scale or add functionality on demand. It doesn't matter then what variety of cloud the data center is part of.
The concept is appealing. SAP is saying that if you are an SAP customer, you don't have to commit to any particular notion of a cloud. In fact, you can use as many flavors as you want; you will still be able to integrate with your on-premise SAP system and reap the benefits.
It will be interesting to see how this works in real life, and I'm looking forward to the first case studies on companies using SAP's approach.