Stock futures higher, but crude oil weakens

* Despite that, energy shares could come under pressure as crude oil fell sharply, due to a possible deal with Iran that could bring an end to sanctions and allow an increase in the country's oil exports. Crude oil fell 1.8 percent to $47.94 per barrel. * Both the dollar and commodity prices have given investors reason to be cautious of late, especially going into the first-quarter earnings season, where traders will look to see how much oil prices and the strong U.S. dollar will impact corporate bottom lines. Last week, the S&P 500 fell 2.2 percent, the Dow lost 2.3 percent and the Nasdaq declined 2.7 percent.

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