Updated from 6:10 a.m. EST

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Here are five things you must know for Tuesday, Nov. 29:

1. -- Oil prices tumbled Tuesday on reports that Russia's oil minister wouldn't attend the OPEC meeting in Vienna on Wednesday, raising doubts that an agreement on production cuts among the world's biggest producers can be reached.

Crude oil in the U.S. early Tuesday 1.8% to $46.25 a barrel. 

OPEC aims to limit production to 32.5 million to 33 million barrels a day, though some countries have reportedly expressed resistance to the production cuts as they are hesitant to cede market share. The bloc pumped a record 33.83 million barrels a day of oil last month.

"We now see a very low chance for an OPEC cut," Bjarne Schieldrop, chief commodities analyst at Nordic bank SEB, told Reuters.

Saudi Arabia's oil minister on Monday cast doubt on an agreement being reached Wednesday.

Instead of cutbacks, Khalid Al-Falih said OPEC should sit back and let demand drive up prices "without an intervention from OPEC."

2. -- U.S. stock futures pointed to a mild rebound Tuesday as oil prices declined and Wall Street awaited revised third-quarter U.S. GDP data.

The Dow Jones Industrial Average and S&P 500 on Monday fell for the first time in five sessions.

The economic calendar in the U.S. on Tuesday includes the second estimate of third-quarter GDP at 8:30 a.m. EST, the Case-Shiller 20-City Index for September at 9 a.m., and Consumer Confidence for November at 10 a.m.

The first estimate of third-quarter GDP came in at 2.9%, the fastest pace in two years. Economists surveyed by FactSet expect GDP to be revised higher to 3%.

Federal Reserve Vice Chair Stanley Fischer is scheduled to speak to the Clearing House annual conference in New York at 7:45 a.m.

Tiffany (TIF) - Get Report  posted third-quarter earnings of 76 cents a share, topping analysts' forecasts by 9 cents. Revenue of $949.3 million also beat estimates. Same-store sales in the quarter fell 2% though came in better than forecasts. 

The stock rose 3.6% in premarket trading on Tuesday.

Earnings are also expected Tuesday from Splunk (SPLK) - Get Report and Autodesk (ADSK) - Get Report .

3. -- Actelion (ALIOY) shares traded sharply lower in Zurich Tuesday following reports that the Swiss biotech company was looking at strategies that would keep it independent in the face of a reported $17 billion approach from Johnson & Johnson (JNJ) - Get Report

Actelion shares were down about 5% after the Financial Times said Europe's biggest biotech was exploring ways to combine parts of its company with J&J, including having the J&J retain a major stake, but wasn't looking at an outright sale.

Other potential suitors for Actelion include France's Sanofi and Swiss drugmaker Roche.

especially since CEO Olivier Brandicourt last month reiterated his interest in acquisitions as it announced plans to sell its European generics business. Sanofi shares gained 1.38% in Paris Tuesday.

4. -- Delphi Automotive (DLPH) - Get Report signed a deal with Intel (INTC) - Get Report to buy high-powered computer processors for Delphi's future autonomous-vehicle systems.

Delphi said Intel's added computing capacity will be needed as autonomous-car systems gather and store more and more information while expanding their ability to deal with situations on real roads.

In August, Delphi announced that it had joined with software maker Mobileye (MBLY) to develop the building blocks for a fully autonomous car in about two years.

Intel will supply Delphi with high-capacity computers needed to process input from radar, cameras and laser sensors as well as maps of roadside landmarks.

Glen De Vos, vice president of Delphi's business-services unit, told the Associated Press that the Intel deal gives the company everything it needs to develop an autonomous-driving package to sell to automakers. Delphi makes its own radar and laser sensors and uses Mobileye's cameras and software.

5. -- Adobe Digital Insights said Cyber Monday was on track to hit a new record with $3.39 billion spent online, a 10.2% increase from last year, and would mark the largest online sales day in history.

Black Friday, the day after Thanksgiving and the unofficial start to the holiday shopping season, saw online sales of $3.34 billion, according to Adobe.