Next Wednesday, 8th August, at 9.00pm on National Geographic a one hour programme:
"History's Conspiracies: The Romanovs
Over 70 years after the Romanovs were killed by the Bolsheviks, the bodies of Tsar Nicholas II and his family were exhumed. Two children were missing. Did Alexei and Anastasia escape?"
There isn't any more info. I don't know if it's a repeat or if it's been shown elsewhere with a different title.