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US stock futures mixed; Apple launch eyed

U.S. stock-index futures fluctuated on Tuesday, with Apple helping lift Nasdaq 100 futures ahead of the consumer-technology company's anticipated debut of a smartwatch.

Annie's rose in early New York trade after General Mills said it would acquire the producer of organic food for about $820 million. Barnes & Noble fell as the struggling book seller reported quarterly results.

The National Federation of Independent Business said its index of small-business optimism edged higher last month, with more owners expecting conditions to improve in coming months.

JOLTS job openings data for July is due at 10 a.m. Eastern.

The dollar gained against the currencies of major U.S. trading partners; the 10-year Treasury note yield used in figuring mortgage rates and other consumer loans rose 3 basis points to 2.504 percent.

A federal lawsuit accused Walt Disney and other leaders in the special effects and animation industry of conspiring to suppress wages through "no-raid" agreements. The lawsuit was filed in San Jose, Calif.

Outside of the U.S., the European Commission announced that Google would have to make more concessions to settle a four-year probe into alleged violation of European competition rules.

Europe formally adopted a package of new sanctions against Russia late on Monday, but said their enforcement would be delayed to assess the sustainability of the cease-fire in Ukraine.


—By CNBC's Katy Barnato