56-year-old Gu Kailai has been serving a suspended death sentence since 2012 after being convicted for the murder of British businessman Neil Heywood.
The case sparked a nationwide uproar after the Police chief of Chongqing city, which was governed by Bo, fled to American Consulate fearing reprisals for prosecuting her.
In an unexpected move, the Beijing high court in a November 16 datelined statement released today said Gu has shown good behaviour during prison labour and during "thought, cultural and technical study."
Bo, who was later arrested and prosecuted for corruption and abuse of power including interfering in investigations against Gu, is currently serving a life sentence in prison.
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Gu was speculated to have business dealing with Heywood who died under mysterious circumstances in 2011 in Chongqing city. She was accused of poisoning him after he reportedly threatened to harm her son who was studying abroad.
Wang came out of the Consulate after he was promised protection by the central government.
Wang himself was sentenced to 15 years in prison in 2013 for various acts of corruption and highhandedness.