It's all marketing bullshit.
Cloud vs Managed infrastructure / applications that IBM have been doing in their datacentres for years.
There is no difference other than the underlying platform is all ESX or VMware imaged so setup can be automated and scripted for reduced startup time, and that cross frame resources can be added or removed "on account" until requir...
... sorry, I caught myself not using marketing bullshit... of course I mean "be made elastic".
* Facepalm *