ROSALabs, Mandriva's partner on their last desktop, has been working on their own Linux distribution and have recently announced their latest release. If you liked Mandriva 2011, then you'll probably like ROSA Marathon 2012. In fact, to the casual observer, it looks like ROSA 2012 is Mandriva 2011.
While trying to find differences in Mandriva 2011, ROSA 2011, and ROSA 2012, one finds very little. Firefox, kdelibs, and qt are among the few updated software versions. The release announcement states, "ROSA Marathon 2012 operating system is the first product of ROSA company created using our own software development and build environment - ROSA ABF - that gives us complete control of package base and development tools, guarantying technological independence and high quality of the distribution."
rest here