UPDATE 1-China's Wanda, Tencent and Baidu team up for $813 million e-commerce deal-sources

BEIJING, Aug 27 (Reuters) - China's privately-held Dalian Wanda Group is set to launch a 5 billion yuan ($813 million) e-commerce joint venture with domestic internet giants Tencent Holdings Ltd and Baidu Inc, according to two sources familiar with the investment.