Emery King is leaving NBC News after five years to become an anchor with WDIV, the Post-Newsweek station in Detroit . . .

King covered the White House for NBC for three years but several months ago asked to be relieved of the assignment. Since then he has been on general assignment with the NBC News bureau here . . .

King came to NBC from WBBM, the CBS-owned TV station in Chicago in 1980 . . .

CBS Entertainment yesterday announced schedule changes for mid-January affecting both the Sunday night lineup (which doesn't need any help) and the Wednesday night lineup, which needs plenty . . .

Starting Sunday, Jan. 12, CBS will introduce regular two-hour made-for-TV movies at 9 p.m., obviously relying on the big audiences for "60 Minutes" and "Murder, She Wrote" between 7 and 9 p.m. to continue to carry the winning evening for the network . . .

After its Jan. 5 appearance, the current 9 p.m. Sunday occupant, "Crazy Like a Fox," will be dispatched as of Jan. 15 to the 9-to-10 p.m. Wednesday slot, which started out in September occupied by "Charlie & Co." and "George Burns Comedy Week" . . .

"George Burns" had been canceled earlier and CBS said yesterday that after its Jan. 8 appearance, "Charlie" will be shelved only to return later this year . . .

"Trapper John, M.D.," the current 10 p.m. Sunday occupant, is also being yanked after its Jan. 5 telecast amid promises that it, too, will return . . .

With yesterday's changes, only "The Equalizer" at 10 p.m. remains from the four new series CBS introduced on Wednesday in September . . . "Stir Crazy," which occupied the 8-to-9 slot originally, was the first to go . . .

Earlier this month, CBS introduced "Mary" and "Foley Square" as replacements for "Stir Crazy." They've improved on "Crazy's" performance, but not much . . .

All this fall the Wednesday combination of NBC's "Highway to Heaven" plus ABC's "Dynasty" and "Hotel" has spelled l-o-w r-a-ti-n-g-s for the CBS entries . . .

The decision to replace "Crazy" and "Trapper" with a movie was based on the success of four "movies" -- "Amos," Part I of "Kane & Abel," Part I of "Doubletake" and "A Christmas Carol" -- in the 9 p.m. Sunday slot this fall. Together, they averaged a 33 percent audience share . . .

The new Sunday series will kick off Jan. 12 with "Rockabye," starring Valerie Bertinelli as the mother of a 3-year-old son who is kidnaped in broad daylight in New York City . . .

Diane Fields, area development director of the Washington office of the United Negro College Fund, said yesterday that the six-hour "Lou Rawls Parade of Stars" telethon this past weekend on behalf of the fund raised at least $5 million nationally. . .

Fields said that last year -- the first for the Rawls telethon effort on behalf of the fund -- final figures were 28 percent above the amount pledged during the original telecast and she expects totals to climb considerably by the final accounting. In Los Angeles, fund officials late yesterday said $7.7 million had already been pledged. . . .

This year the telethon aired on some 50 stations around the country. Last year's telethon, which was 12 hours in length, aired on more than 75 stations and raised a total of $10.1 million . . .

Fields said Channel 20 viewers here pledged more than $148,000 Saturday night for the fund while Channel 11 in Baltimore raised more than $202,000 . . . Also in the News

Channel 7 yesterday announced it has chosen two game shows to replace the canceled "America" magazine in the 4-to-5 p.m. weekday time slot . . .

"America" winds up on Friday. Monday at 4, "$1,000,000 Chance of a Lifetime," hosted by Jim Lange, moves in, followed at 4:30 by "Sale of the Century," cohosted by Jim Perry and Summer Bartholomew . . .

CBS News in New York yesterday announced a batch of overseas correspondent reassignments . . .

Richard Roth, now at the Rome bureau, returns to New York; Mark Phillips goes from Moscow to Rome; Wyatt Andrews from Tokyo to Moscow; Barry Petersen from San Francisco to Tokyo; John Blackstone from Paris to San Francisco; and Doug Tunnell from Bonn to Paris . . .

NBC's "Today" show won the early morning network race for the week ending Dec. 20, the third week in the past four it has outpaced ABC's "Good Morning America" for the top spot . . .

"Today" had a 5.3 Nielsen rating and a 24 percent audience share, compared with "GMA's" 5.1/23 and "CBS Morning News' " 3.0/13 . . .

Only twice since April 1982 (the other was the week ending Sept. 20 of this year) has the CBS program dropped to a 13 share . . .

Meanwhile, "Today" now expects to tie "GMA" at least in share points in the fourth quarter (October through December) for the first time since the second quarter (April through June) of 1981 . . .

CBS News said yesterday it will air the New Year's Day messages to be exchanged by President Reagan and Soviet leader Mikhail Gorbachev between 1 and 1:30 p.m. on Wednesday . . .

NBC said it will air the messages starting at 1:15 p.m. ABC on Friday announced it will air the exchange, to be seen by Soviet and U.S. viewers, starting at 1 p.m. . . .

By the way, CBS News misspoke on Friday. "CBS Evening News" anchor Dan Rather will be off until Jan. 13. Charles Kuralt will replace him this week, Bob Schieffer next week. Honestly, CBS! . . .

"Behind Enemy Lines," an NBC pilot about OSS activities in World War II, averaged a 14.0 rating and a 22 share in Nielsen's top 12 markets Sunday night. That included a skinny 10.8/18 on Channel 4 here . . .