The list of changes is here (and was posted by Richard in the first post of this thread), it is nearly exclusively bugfixes to get rid of the annoying issues:
[Fw1]
We are pleased to release new firmware for Uniti Atom, Star and Nova systems; plus ND5 XS 2, NDX 2 and ND 555 streamers. We have worked closely with an enlarged beta-test group to improve a range of playback and display issues, detailed below. Thanks to the beta team for all their input on this and ongoing software releases.