I wrote up a piece over at UCStrategies.com discussing how Cloud computing and UC (equally nebulous terms) may intersect. I think it has more to do where you are coming from than where you are going to.
Organizations coming from a hardware perspective will likely keep their telecom solutions on-site, and people coming from a software perspective may be quick to jump into the cloud. Certainly the traditional PBX makers are working to get ready for the cloud – working on software-only released of their core products and becoming hardware independent.
It gets very “cloudy” when the cloud and the SaaS models begin to overlap.
You can read the article here.