FluxCP in it's current state has been known as version 1.2 since Xantara forked the original FluxCP repo from googlecode. There have been numerous updates since that fork began, and in order to move forward we feel it is necessary to address larger compliance and security issues with the software.
This release is the last version that will work with currently available addons and themes. Future releases will contain documentation on updating current addons and themes to work with later versions of FluxCP.