What sort of API will it offer?
Does this use some sort of JSON, REST based API communication via simple HTTP queries and an API key?
What is very very important to me: Will there be limits in usage of the API? I hate limited API's, just saying >_<
Is it meant to run only with directly comunicating to your servers, or can ClaraIO also be run somehow inhouse (for security reasons of course).
Can we develop our own extensions for it, and bundle them in a somehow standalone manner? (similar to ready-to-install extensions) If so, what about something like a marketplace or extension center?