Swift templates is a way to use a simple templating language to create custom templates from within the admin area, and even the Publish page. I suppose for the right client and use case it would be helpful, but for the type of work I do creating simple sites for clients, it doesn’t really apply.
That said, I’m curious to see how it evolves and if anyone has experience using it. You can read more about the feature here or check out the WordPress Creation Kit, which it is a part of.
WordPress Educator Zac Gordon 