I would love to see an official static site mode for Ghost (and Wordpress). That way we can get both a nice authoring experience and the low cost/security of S3 hosting.
Would be amazing if I didn't need to know a completely separate technology and/or hack together bridges/site "staticizers" in order to have a quite basic functionality (the site be 100% static when no back-end dynamic interaction is needed).
That said, there are third party plugins for WordPress that do this. Don't know about ghost, but my hopes are for first-class support for this.