The SARK devs are now launching their ultra low power SARK 200 based on ARM and will be commercially supporting them. Contact me offline if you want the last released version. Most of my requests for older released versions have been in vain though.
Also, SAIL is undergoing a large code consolidation effort to make it's deployment in Debian/RHEL/CentOS/SME8 uniform from a single codebase.
Note that usage of and dependance on SAIL will have to be based on realising that the sarkhpe sources will not be disclosed.