We have just published a bugfix release for Solarus, which is now at version 1.6.4. The short-lived 1.6.3 version has been released yesterday, but has been immediately followed by the next one, because of an important bugfix.
Here is the exhaustive list of all changes brought by Solarus 1.6.4. Thanks to all contributors.
This release does not add new features to the Lua API.