According to Arkham, Mt Gox transferred 0.021 BTC to Bitstamp and an unmarked address: 1C9VoV...Rt81Fa at 14:19 UTC+8 today, worth about $1,390, which may be a transfer test. Currently, Mt Gox holds a total of 90.344k BTC, worth about $6.07 billion. https://platform.arkhamintelligence.com/explorer/entity/mt-gox