Stock index futures pointed to a lower open on Wall Street on Wednesday, with contracts for the S&P 500 and Nasdaq 100 down 0.5 percent, while Dow Jones futures were down 0.3 percent at 4:00 a.m. EDT.
European shares were a touch lower on Wednesday as concerns over global growth were compounded by as a survey showing a seventh month of contraction for the euro zone's private sector in August, suggesting the bloc is likely to have slipped back into recession in the current quarter.
Japan's Nikkei average fell to a near five-week closing low on Wednesday as soft U.S. manufacturing data and construction spending added to concerns about a global economic slowdown.
The Labor Department releases revised Q2 Productivity and Unit Labor Costs at 1230 GMT. Economists in a Reuters survey forecast productivity to rise 1.8 percent versus a 1.6 percent rise in the preliminary Q2 report. Unit Labor costs are expected to increase 1.5 percent compared with a 1.7 percent increase in the preliminary Q2 report.
The FBI said on Tuesday there was "no evidence" to support claims that hacking group Anonymous infiltrated an FBI agent's laptop and lifted a file with identification numbers for more than 12 million Apple products.
Automakers turned in their best August since before the 2007-09 recession, with U.S. monthly auto sales rising 20 percent from a year ago as consumers with aging vehicles showed more confidence in buying big-ticket items on easier credit terms.
General Motors Co
U.S. health regulators on Tuesday approved a Pfizer Inc
Rupert Murdoch's News Corp
U.S. airlines could place hundreds of orders for new jets on top of their recent wave of purchases -- leaving billions of dollars' worth of orders for U.S. manufacturer Boeing Co
Capital One Financial Corp
U.S. tax preparer H&R Block is expected to post a $0.39 loss per share in its first quarter, steeper than the $0.37 recorded a year earlier. The company may discuss steps it is taking to boost its share in the digital tax filing market where it faces stiff competition from software company, Intuit.
The Dow Jones industrial average <.DJI> ended down 54.90 points, or 0.42 percent, at 13,035.94 on Tuesday, while the Standard & Poor's 500 Index <.SPX> was down 1.64 points, or 0.12 percent, at 1,404.94.
A rally in Apple helped the Nasdaq Composite Index <.IXIC> rise 8.09 points, or 0.26 percent, to 3,075.06, after the tech giant distributed invitations to an event in San Francisco on September 12, setting the stage for what is widely expected to be the release of the iPhone 5.
(Reporting By Francesco Canepa; Editing by John Stonestreet)