BUZZ-Petroleo Brasileiro SA: Date for fuel price revision unclear
** Brazilian state-run oil company's U.S.-listed shares down 4.7 pct at $10.63 premarket
** Company says it has no date for a widely expected increase in the domestic price of gasoline and diesel
** Refining and supply division has lost more than $24 billion since the end of 2010 mainly due to government's refusal to raise domestic fuel prices
** Also denies reports that auditor PricewaterhouseCoopers refused to approve company's accounts amid concerns about corruption within company
** Schedules next board meeting for Nov. 14 to discuss company's Q3 results
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