Freeze Shock and Ice Burn were discovered when people used Metronome. Like Pwnyta said, these probably are the signature moves of Kyurem. It is possible that Nintendo may release this Kyurem in the future. Kyurem is believed to be the the trio master of Tao trio (Zekrom, Reshiram), signifying that it may come with special moves, like Arceus, head of the Creation trio (Dialga, Palkia, Giratina) came with moves like related to its trio: Roar of Time, Spacial Rend, and Shadow Force.
It is now believed that these two moves are the signature moves of White and Black Kyruem. "Freeze Shock" relates to both Kyruem and Zekrom, and "Ice Burn" relates to Kyruem and Reshiram.