Here are five things you must know for Tuesday, Sept. 26:

1. -- U.S. stock futures pointed to a mixed start for Wall Street on Tuesday, Sept. 26, with futures for the Dow Jones Industrial Average indicating the blue-chip index would open flat after falling for three straight sessions.

Dow futures rose 0.2% on Tuesday, S&P 500 futures fell 0.03%, and Nasdaq futures rose 0.14%. On Monday, Sept. 25, the Nasdaq fell 0.88%, posting its worst daily performance since Sept. 5 as bad news for Apple Inc. (AAPL) - Get Report triggered a selloff in the technology sector. The Dow fell 0.24% on Monday, marking its third down day in a row, and the S&P 500 fell 0.22%.

The economic calendar in the U.S. on Tuesday includes the S&P Corelogic Case-Shiller Home Price Index for July at 9 a.m. ET, New Home Sales for August at 10 a.m., and Consumer Confidence for September at 10 a.m. The highlight Tuesday, however, will be an appearance by Federal Reserve Chair Janet Yellen at the National Association for Business Economics Meeting in Cleveland. Yellen is scheduled to deliver the keynote luncheon address at 11:50 a.m. Cleveland Fed President Loretta Mester will moderate a panel discussion on the global outlook at the same meeting at 9:30 a.m.

Earnings reports are expected Tuesday from Darden Restaurants Inc. (DRI) - Get Report , FactSet Research Systems Inc. (FDS) - Get Report , Micron Technology Inc. (MU) - Get Report and Nike Inc. (NKE) - Get Report .

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2. -- Oil prices slipped early Tuesday after hitting two-year highs on fears that Turkey could turn off pipelines out of the Kurdistan region and following bullish supply and demand predictions from traders and analysts.

West Texas Intermediate futures fell 0.4% to $52 a barrel. Futures for Brent crude, the European benchmark, fell 0.63% to $58.06 a barrel.

Turkey's President Tayyip Erdogan on Monday, Sept. 25, said he could close the pipeline running out of the Kurdish region of Northern Iraq in response to a non-binding independence referendum that was held on Monday. The pipeline to the Turkish port of Ceyhan pumps about 500,000 to 600,000 barrels of oil per day and is the main transport route for the Kurdish regions oil exports.

3. -- KKR & Co. (KKR) - Get Report is trying to persuade Apple to switch sides and join the private-equity firm in a bid for Toshiba Corp.'s (TOSYY) flash memory chip business, Bloomberg reported, citing a person familiar with the discussions. 

Just days ago, Toshiba agreed to sell the unit to another group, led by Bain Capital, that included Apple, Dell Inc., SK Hynix Inc. and Seagate Technology PLC  (STX) - Get Report for for 2 trillion yen ($18 billion).

Apple has yet to agree to final terms with Bain and is negotiating the volume of chips to be supplied, another person familiar with the matter told Bloomberg. 

Switching to the KKR group from the Bain group would require Apple to become more comfortable with Western Digital Corp.'s (WDC) - Get Report role in its manufacturing joint venture partnership with Toshiba after the acquisition and that may still prove a sticking point, the person told Bloomberg.

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4. -- Nvidia Corp. (NVDA) - Get Report CEO announced late Monday that his company would provide provide artificial intelligence-focused GPU hardware to the data centers and cloud-service infrastructures at Alibaba (BABA) - Get Report Cloud, Baidu Inc. (BIDU) - Get Report and Tencent Holdings Ltd. (TCTZF) .

"AI is the most important technology development of our time, with the greatest potential to help society," Huang said. "As the world's leading cloud providers deploy the world's best AI platform, with Volta GPUs and Nvidia software, we'll see amazing breakthroughs in medicine, autonomous transportation, precision manufacturing and much more." 

Nvidia said in a news release that Alibaba Cloud, Baidu and Tencent are upgrading their massive data centers, shifting from Nvidia's Pascal architecture-based systems to Volta-based platforms, which offer greater speed and scalability for AI inferencing and training.

The stock rose 3% in premarket trading.

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5 -- Walt Disney Co. (DIS) - Get Report is testing the first major redesign of its retail stores in seven years, adding interactive experiences and live streams of theme park parades, according to a report from Reuters.

Disney, the world's largest entertainment company, also is launching a new shopping website on Tuesday, executives told Reuters in interviews.

The moves by Disney are responses to the decline in shoppers who visit brick-and-mortar stores across the retail industry. 

"We knew we needed to elevate and improve the experiences that we have both in stores and online as retail is changing," Paul Gainer, executive vice president of Disney retail, told Reuters in an interview.

This story has been updated from 6:06 a.m. ET.

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