Stock index futures are modestly higher after news import prices rose at a slower pace in April, and that margins for crude futures were raised 25 percent.
Microsoft fell after news the tech giant was closing in on a deal to buy Skypefor $8.5 billion including debt, a source familiar with the situation told Reuters.
In earnings news, Dean Foods soared after delivering a better-than-expected profit in the first quarter, boosted by sales of its Horizon Organic milk. The dairy company also boosted its 2011 outlook.
On the economic front, U.S. import prices rose 2.2 percentin April, following a 2.6 percent gain in March, the Labor Department said on Tuesday. Economists surveyed by Reuters had expected only a 1.8 percent rise.
Also, an index of small business owner sentiment fell 0.7 point to 91.2 in April even as sales performance improved. The drop in theNational Federation of Independent Business's small-business optimism index follows a 2.6-point drop in March.