Any opportunity to smear Yukos (and its "bad" oligarchs) will be taken. Of course, "good" oligarchs (e.g. Kremlin bootlickers) never get smeared or harassed (or killed).
Yukos as a company is dead, and no Russian or international court is going to change that; and its death was not caused by either Litvinenko or Nevzlin; and niether one had anything to gain, financially or otherwise by the death of the other.
But a Russian government finding another Jewish scapegoat is always a very useful thing - to that government.
Czarist Russia has never changed; even throughout the "Soviet" period and up to now. It just keeps changing how it finds and designates new Czars.