Spree 1.1.1 has been released. This release is just a minor patch release to fix a few issues with the previous release. There are no security fixes in this release so there is no rush to upgrade if things are working fine for you.
The primary reason to upgrade is if you are experiencing issues with the new 2.1.x version of Devise which may get used by bundler in new Spree deployments. Please see the Github compare for a complete list of changes in this release.