When the Blue Lion project was announced at the American WarpStock in October 2015, the name was only temporary. Following the close of events at WarpStock Europe, Arca Noae managing member Lewis Rosenthal noted in an interview that the final product name for the new OS/2 distribution is ArcaOS 5.0. The significance of the version number relates to IBM OS/2 4.52 – the last maintenance release of the platform released by IBM in 2001.
ArcaOS 5.0 is expected to be released in the fourth quarter of 2016, but Blue Lion remains as a code name, in much the same way “Wily Werewolf” is the code name of Ubuntu 15.10.
ArcaOS is a sort-of continuation of eComStation, since it’s founded by several eCS developers who felt eCS had ground to a halt.