By Barbara Kollmeyer, MarketWatch

MADRID (MarketWatch) -- After a long weekend break, U.S. stock-market futures traded cautiously ahead of Wall Street's open, as investors pored over earnings from DuPont and awaited others. Existing-home sales data, and a regional manufacturing index were also on tap.

Markets were closed Monday for the Martin Luther King Jr. Day.

Futures for the Dow Jones Industrial Average (DJH3) fell 17 points to 13,559. Futures for the Standard & Poor's 500 index (SPH3) fell 1 point to 1,477.90.

Futures for the Nasdaq 100 index (NDH3) edged up 2.25 points to 2,736.

Fawad Razaqzada, market strategist at GFT Markets, said futures markets moved lower earlier after the Bank of Japan announced it will adopt a 2% inflation target and commence an open-ended asset-purchasing program beginning January 2014.

"Everyone was expecting this, so it was a case of buying the rumor and selling the fact," said Razaqzada. He added that markets also got jittery on speculation that a member of the European Central Bank could be stepping down.

But futures losses eased after the German ZEW economic-expectations index, a gauge of investor sentiment, rose more sharply than expected in January.

But away from global factors, U.S. markets will be focusing squarely on data and earnings to come.

Getting back into the swing of things after Monday's break, investors will be looking out for a read on the housing market, with existing-home sales due at 10 a.m. Eastern time. Economists polled by MarketWatch are expecting sales of 5.10 million for December versus 5.04 million in the prior month.

Ahead of that at 8:30 a.m. Eastern, the Chicago national activity index will be released.

Earnings season also gets back on track. DuPont (DD) reported fourth-quarter adjusted earnings on operations of 11 cents versus 26 cents in the year-ago period. Analysts polled by FactSet Research were expecting DuPont to post fourth-quarter earnings of 7 cents a share. The group posted revenue of $7.57 billion against forecasts for sales of $7.15 billion. Shares of DuPont rose over 1% in premarket.

Johnson & Johnson (JNJ) is forecast to turn in earnings of $1.17 a share for the fourth quarter.

After the closing bell, Google Inc. (GOOG) and International Business Machines Corp. (IBM) will deliver results.

"Delta Airlines, IBM and Google are just some of the highlights today, and with many analysts cautious on the outlook for the tech sector, there's every chance that even some modest showings here could initiate further buying," said Razaqzada.

Within other corporate news, shares of Research in Motion Ltd. (RIMM) rose 8% in premarket trading. Shares surged the prior day in Canada to a 13-month high after the group's chief executive told a German newspaper the company may sell its handset business or license to rivals.

U.S. stock markets closed out with a third straight week of gains on Friday. Strong earnings news and upbeat news on the debt ceiling also helped sentiment. The S&P 500 index (SPX) rose 5.04 points, or 0.3%, to finish at 1,485.98, its highest close since December 2007. The index rose 1% for the week.

The dollar initially gained around a yen on the Bank of Japan news before pulling back and was weaker across the board. The dollar index (DXY) , which measures the greenback against a basket of several currencies, fell to 79.801 from 80.046 late on Monday.

Bundesbank President Jens Weidmann, who is also a member at the European Central Bank Governing Council warned in a speech late Monday of a potential "currency war" as central banks pump out cash to support economies, media reports said.

In other markets, gold prices edged higher, while crude-oil for February delivery traded lower.

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