The most important change next to some clarification of allowed repackaging in OS-specific package formats is the addition of point 8 of the license:
Read the updated license here: http://www.palemoon.org/redist.shtml8. An exception applies to point 5 of this license {sic: point 5 prohibits the inclusion of Pale Moon in binary form in other software packages/bundles} for inclusion of the officially branded binaries in freely available and fully Open Source operating systems, including but not limited to non-commercial variants of Linux, variants of BSD and ReactOS. This exception only applies to unaltered versions of the Pale Moon binaries or officially branded variants specifically built for the target operating system from unaltered sources (including brand-specific configurations like e.g. home page, default search engine). If any of the essential settings of the browser are altered beyond what is strictly needed for providing a working build on the target operating system, the exception in this point does not apply and the license defaults to point 10, instead.