My first thought that came to mind was the graphic that I've spotted on some stickers "There is no cloud, its just someone else's computer".
Jokes aside there isn't a whole load extra to consider over and above all the other typical considerations that have to be made for any SAS deployment. You still have all the big questions to answer. Sizing, architecture, data access, authentication & authorization, availability, backup and restore, disaster recovery, dev/test/prod environments... all these questions still need answers whether you deploy to the cloud or not.
Deploying to the cloud might see you adjust some of the design choices but big picture whether you are deploying to the cloud or not you typically end up with a similar type of deployment.
There is a good whitepaper about SAS and Cloud Computing. Important Performance Considerations When Moving SAS to a Public Cloud
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