Over on the Evergreen project blog you can find a preview of what’s coming out in version 1.4.
I happen to be a particularly big fan of “pre-overdue notices” — the notices that tell me my books will soon be due. They don’t actually change my behavior; I read the notices, I think I am going to click on the link to renew the books, and then I forget to do it… then the overdue notice arrives, and I think, “Oh… right.” But I feel so much better about the library for sending them — and I know that a lot of people can and do respond to pre-overdues. They save libraries time and money, to start with, because every overdue brings its own overhead.
There’s lots more happening with 1.4, of course, but when it’s “your” feature, it makes it feel like they baked a cake Just For You.