OS 8.2.55 has been released for all Series 4 (XTx44/XDx34/HDx24/HS124/LS424) and Series 3 (XTx43/XDx33/HDx23/HS123/HO523/LS423) models, as well as the 4Kx42 and AU3x5.
OS 8.2.55 contains bug fixes and optimizations, as well as lays the groundwork for supporting cellular modems over USB as a means of connectivity. These features are still in development.
It is now available on the Software Downloads page. See the release notes beneath each download link for a description of new features and bug fixes.