Here are five things you must know for Wednesday, Dec. 6:

1. -- U.S. stock futures were tumbling on Wednesday, Dec. 6, European shares turned mixed and equities in Japan fell the most in nine months as investors continued to rotate out of tech stocks and moved to the relative safety of bonds.
 
Tech stocks took it on the chin in the previous session too, with the tech-heavy Nasdaq index falling 0.2%. The index has fallen 1.25% for the week. The S&P 500 fell Tuesday, Dec. 5, for a third straight session.
 
It appears investors have begun taking cover in government bond markets ahead of next week's Federal Federal Reserve meeting in Washington. It's largely expected the central bank will lift interest rates for the third time this year at its meeting Dec. 12-13. 
 
Wall Street also was looking ahead to a report on private-sector hiring in the U.S., two days before the official U.S. jobs report for November will be released. Besides the ADP National Employment Report for November at 8:15 a.m. ET, the  economic calendar on Wednesday includes Oil Inventories for the week ended Dec. 1, at 10:30 a.m.

Earnings reports are expected Wednesday from Broadcom Ltd. (AVGO) , Lululemon Athletica Inc. (LULU) , H&R Block Inc. (HRB) , Hovnanian Enterprises Inc. (HOV) and Vera Bradley Inc. (VRA) .

Broadcom is a holding in Jim Cramer's Action Alerts PLUS Charitable Trust Portfolio. Want to be alerted before Cramer buys or sells the stock? Learn more now. 

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2. -- Bitcoin surpassed $12,000 for the first time on Tuesday, Dec. 5, just a week after breaking through $10,000.

The digital currency was trading below $1,000 at the start of the year.

At last check, according to Coindesk.com, the cryptocurrency was selling for just over $12,704.63.

As the price of the largest cryptocurrency by market value skyrockets, so has the number of accounts being opened. But the trading frenzy and steep ascent of Bitcoin has worried many investors and traders.

"Bitcoin is now officially an investor mania," warned Josh Brown from Ritholtz Wealth Management.

3. -- Ford Motor Co. (F) is expected to sign as early as Thursday, Dec. 7, a deal with Alibaba Group Holding Ltd. (BABA) which may allow the U.S. automaker to test selling cars to consumers in China through Alibaba's online retail arm Tmall, as well as through a new "auto vending machine" store concept, a Ford source familiar with the matter told Reuters.

Ford's executive chairman, Bill Ford Jr., and CEO Jim Hackett are expected to be in Hangzhou on Thursday to sign a letter of intent that outlines the scope of the new partnership, Reuters reported.

The deal is intended to position Ford for an emerging Chinese marketplace where more cars could be sold online, the source told Reuters.

4. -- Alphabet Inc.'s (GOOGL)  Google will its YouTube from Amazon.com Inc.'s (AMZN) Fire TV and Echo Show devices as the feud between the two tech giants escalates.

Google's move to block YouTube is retaliation for Amazon's refusal to sell some Google products that compete with Amazon gadgets, the Associated Press noted. That includes Google's Chromecast streaming device, an alternative to Fire TV, and Home, an internet-connected speaker, which is battling it out with Amazon's Echo.

"Given this lack of reciprocity, we are no longer supporting YouTube on Echo Show and Fire TV," Google said in a statement. Amazon didn't immediately respond to requests for comments made by the AP.

Alphabet is a holding in Jim Cramer's Action Alerts PLUS Charitable Trust Portfolio. Want to be alerted before Cramer buys or sells GOOGL? Learn more now.

5. -- Canada is scrapping a plan to buy 18 Super Hornet fighter jets from Boeing Co. (BA) amid a deepening dispute with the U.S. aerospace giant, three sources familiar with the matter told Reuters.

The Liberal government instead will announce next week it intends to acquire a used fleet of older Australia F-18 jets, the same kind of plane Canada currently operates, the sources said.

Canada is angry over a move by Boeing to launch a trade challenge against Canadian planemaker Bombardier Inc., which Boeing accuses of dumping airliners on the American market.

Boeing shares rose 0.7% in premarket trading.

This story has been updated from 6:08 a.m. ET.

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