Spree 1.0.4 has been released. This is just a minor patch release that contains several minor fixes made since the prior release. There are no security fixes contained in the release so there’s no need to upgrade unless you’re experiencing one of the problems fixed in this release.
Please see the Github compare for a complete list of changes in this release. If your store is not yet running on a 1.0.x version of Spree you are encouraged to upgrade at your earliest convenience. Once Spree 1.1.0 is released we will no longer be maintaining versions of Spree prior to 1.0.x except in the case of a critical security fix.