Summary: Derivatives of Mandriva are very much alive, with recent or upcoming releases
NOW, as in previous years, a new release of Mageia is imminent [1,2], promising to beat Mandriva to it  but not PCLinuxOS, which has just released its December edition (2013.12) . Mandriva is now based in Russia and just like Red Hat (historically a relative of Mandriva) it might be benefiting from the NSA scandals. Well, governments cannot tolerate espionage and in Free/libre systems like Mandriva (with derivatives) not even KGB agents like Putin can successfully hide back doors.
For those who think that Mandrake/Mandriva are gone and are merely part of history it should be important to recognise forks and derivatives, including OpenMandriva. One day it might be a Mandriva derivative — not a RHEL or Debian derivative — that becomes the most widely used GNU/Linux distribution (or operating system). ChromeOS and SteamOS, for instance, are based on rather different systems of GNU/Linux. There’s no one-horse race. █
Related/contextual items from the news:
Nearly 18 months after the company was re-organised, Mandriva, the French GNU/Linux company is making progress towards a release, according to Charles-H. Schulz, its marketing and open source relations manager.