1. All eyes on Apple

Apple is set to unveil its latest smartphone model at an afternoon event. Much of the focus is on whether the iPhone 7 will be compatible with standard headphones or require customers to buy new ones.

Apple shares could have a bumpy ride as the event gets underway and investors react to product announcements.

3. Gold hovers near 3-weeks highs

Gold slipped back from two-and-a-half week highs hit following the reduction in the odds that the Fed will return to policy normalization this year.

The slight turnaround accompanied a meager rebound in the dollar that was attempting to move off one-and-a-half week lows.

Gold for December delivery on the Comex division of the New York Mercantile Exchange inched forward 185 cents, or 0.14%, to trade at $1,352.15, by 10:01AM GMT, while U.S. dollar index, which measures the greenback’s strength against a trade-weighted basket of six major currencies, edged forward 0.12% at 94.91.

3. Earnings and Economics

It's a light day for earnings. After the market closes, HP Enterprises (HPE, Tech30) will post its quarterly results, alongside Canadian tea company, DavidsTea (DTEA), which listed on the stock market last year.

The Federal Reserve will release its Beige Book for September at 2 p.m. ET, which will give detailed information about the state of the U.S. economy.

4. Global market overview and recap

U.S. stock futures are holding steady and European markets aren't making

The Dow Jones industrial average and S&P 500 each added 0.3% and the Nasdaq gained 0.5% on Tuesday.

Amazon performed particularly well on Tuesday and hit an all-time high.

The company is now worth a staggering $374 billion, which makes it slightly more valuable than Warren Buffett's Berkshire Hathaway (BRKA).

Only Apple, Google's parent Alphabet (GOOGL, Tech30), and Microsoft (MSFT, Tech30) are worth more in the U.S.