In the 1.4 release we tweaked the manner in which the SDK determines its own version (it now uses git-describe when possible). Yesterday, we discovered that this new versioning process conflicted with the way the Add-on Builder deploys the SDK in their application.
Today we released the hotfix version 1.4.1 to address this issue so that the Add-on Builder can push a 1.4 version of the SDK to users. The patch included in the 1.4.1 release gets the version number, if absent from git, from the name of the parent directory.
If you were already using 1.4 in your own environment, you will not need this new version, nor would you see any differences if you decided to upgrade to it. This fix is strictly to help the Builder team launch 1.4 to their users.
If you have any questions or issues with this hotfix release, please ask in any of the following areas:
post to our discussion group
chat with us on irc.mozilla.org #jetpack
report a bug
check out the source and contribute bug fixes, enhancements, or documentation
For more information on the Jetpack Project check out our wiki