"new generation calibre server" would of course be free, part of calibre -- and you could run it on you PC. But putting it in the cloud would require you also have a cloud, after that, the usual way of installing custom services to a web host would apply.
At least the way I understand it, the plan is to turn the current server into just another frontend to the main calibre GUI, with perhaps-collaboration-style multi-user management.
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