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Here are five things you must know for Wednesday, Nov. 28:

1. -- Stocks Rise Amid Possible Breakthrough in U.S.-China Trade Talks

U.S. stock futures were rising on Wednesday, Nov. 28, as investors cheered reports of a possible breakthrough in U.S.-China trade talks this weekend at the G-20 summit in Argentina.

White House economic adviser Larry Kudlow told reporters that Donald Trump and China's Xi Jinping would meet for dinner at the summit on Saturday, Dec. 1. While he cautioned that China's president "has an opportunity to change the tone and the substance of these talks," he nonetheless suggested that "President Trump has indicated he is open" to making a deal to resolve ongoing trade tensions and possibly halt new tariffs on China-made goods.

The olive branch from the White House was followed by an interview with China's ambassador to the United States, Cui Tiankai, who told Reuters that an all-out trade war between the world's two biggest economies was "unimaginable" and hoped the weekend talks could result in a way forward.

Contracts tied to the Dow Jones Industrial Average rose 154 points, futures for the S&P 500 were up 12.50 points, and Nasdaq futures gained 38.75 points. 

2. -- GDP and Tiffany Highlight Wednesday's Calendar

The economic calendar in the U.S. Wednesday includes the second estimate for third-quarter GDP at 8:30 a.m. ET, International Trade in Goods for October at 8:30 a.m., New Home Sales for October at 10 a.m., and Oil Inventories for the week ended Nov. 23, at 10:30 a.m.

Tiffany & Co. (TIF - Get Report)  fell 9.7% after it reported third-quarter earnings of 77 cents a share, which met analysts' expectations, but sales of $1.01 billion that came in below forecasts. Same-store sales were up 2%, but they, too, missed forecasts.

Now take a trip behind the sparkle with a little history lesson:

The luxury jewelry retailer also cut its growth outlook for full-year same-store sales to the "mid-single-digit" percentage range from previous guidance of an increase in the "mid-to-high-single-digit" range.

J.M. Smucker Co. (SJM - Get Report) reported fiscal second-quarter profit and sales that missed Wall Street's expectations and the consumer foods company cut its outlook for fiscal 2019. The stock fell 6.7% in premarket trading. 

Sporting goods retailer Dick's Sporting Goods Inc. (DKS - Get Report) earned 39 cents a share in its third quarter, beating estimates of 26 cents. Net sales of $1.86 billion missed forecasts of $1.88 billion, while same-store sales in the quarter fell 3.9%, narrower than analysts' predictions that called for a drop of 4%.

Dick's raised its guidance range for 2018 earnings to $3.15 to $3.25 a share from prior guidance of $3.02 to $3.20. The stock was up 0.5%.

3. -- Donald Trump Slams Fed Chairman Jerome Powell

Donald Trump criticized the Federal Reserve and its chairman, Jerome Powell, in an interview with the Washington Post in which he accused the central bank of pushing U.S. stocks lower and triggering a decision by General Motors Co.  (GM - Get Report) to shutter five plants in North America and two additional plants outside of North America, and cut 15% of its salaried workforce.

Trump told the Post, in an interview published late Tuesday, that he wasn't "even a little bit happy with my selection" of Powell to head the Federal Reserve, adding that the Fed's current stance on interest rates was "way off base." Trump's remarks followed a similar interview with The Wall Street Journal in which he accused the central bank of being a "bigger problem than China" and comes just hours ahead of a key speech on monetary policy from Powell Wednesday in New York.

Powell is expected to appear at a luncheon at the Economic Club in New York at 11:30 a.m. 

"I'm doing deals, and I'm not being accommodated by the Fed," Trump told the Post. "They're making a mistake because I have a gut, and my gut tells me more sometimes than anybody else's brain can ever tell me."

4. -- Salesforce Jumps on Third-Quarter Earnings Beat

Salesforce.com Inc. (CRM - Get Report) , the cloud software company, posted third-quarter adjusted earnings of 61 cents a share, beating forecasts by 11 cents, but its outlook for fourth-quarter profit came in below forecasts.

Revenue in the quarter was $3.39 billion, up from $2.7 billion a year earlier and topped estimates of $3.37 billion.

The company's closely watched billings proxy -- defined as revenue plus the sequential change in Salesforce's unearned revenue balance -- came in at $2.89 billion, up 28% and above consensus of $2.68 billion.

The stock jumped 9% in premarket trading on Wednesday.

Salesforce said it expects fourth-quarter adjusted earnings of 54 cents to 55 cents a share on revenue of $3.55 billion to $3.56 billion. Analysts surveyed by FactSet were calling for earnings of 57 cents a share on revenue of $3.52 billion. 

However, the company said it expects sees 2020 revenue as high as $16 billion, putting it on track to meet its 2022 target range of $21 billion to $23 billion.

"While the bottom line is a bit lighter than what analysts were forecasting, we think investors should not be fooled," wrote Jim Cramer and the Action Alerts PLUS team, which holds shares of Salesforce in its portfolio. "Overall, this was a great quarter for the company with solid beats across the board. Not only did the company outpace the customer relationship management market again, but it also continues to gain share."

5. -- YouTube's Scaling Back Premium - Report

YouTube said its original video programs, including sci-fi dramas and reality shows, will no longer be reserved for premium subscribers starting next year. Instead, YouTube's original programming will be available on the site for free, with ads, to everyone, Business Insider reported.

A YouTube spokesperson told Business Insider the decision to move its original content outside of its subscription service was in order to expand its audience and "meet the growing demand of a more global fan base."

YouTube Premium launched just eight months ago.

YouTube is a unit of Alphabet Inc.'s (GOOGL - Get Report) Google.