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Tech eyed on Wall Street; Apple, Netflix in focus

Wall Street index futures traded higher on Tuesday, with Apple and Netflix in focus against a backdrop of social unrest in Hong Kong.

Apple stocks could wobble during the session, after European Union regulators told Ireland that "unlawful aid may be recovered" from the tech giant, following a high-profile tax probe.

Read MoreApple's EU tax problems: What you need to know

Aidan Crawley | Bloomberg | Getty Images

Meanwhile, video-streaming site Netflix is to release its first movie—a sequel to the classic "Crouching Tiger, Hidden Dragon"—after striking a distribution deal with The Weinstein Company. The movie will be released simultaneously on Netflix and selected IMAX theaters in August next year and is expected to the first of several Netflix films.

Ford lowered its profit outlook for 2014 due to a series of setbacks, including the recall of 850,000 vehicles with defective air bags.

Stock-index futures trimmed gains after the Case-Shiller home-price index came in under expectations.

Hong Kong's benchmark Hang Seng Index dropped to a three-month low on Tuesday as pro-democracy protesters remained on the streets on Tuesday.

"The region's second largest index will again be the focal point for Asian markets, as Hong Kong sees its largest civil unrest since the 1960s. With Chinese National Day (a public holiday) tomorrow, the likelihood of the crowds increasing is mounting," said Evan Lucas, market strategist at IG.