Well, we might as well tattle -- the latest rumor at "CBS Morning News" is that Sandy Hill is the mystery "West Coast person" we mentioned last week who has been under consideration for a spot on the show . . .

Hill was one of David Hartman's early partners on "Good Morning America." She and David didn't quite get along, so she returned to the West Coast for several anchor jobs at network-owned stations in Los Angeles . . .

CBS News says most recently she was at KCBS . . .

One rumor had Executive Director Susan Winston teaming her with Frank Gifford if the Giffer hadn't opted to remain with ABC Sports . . .

Maria Shriver's agent, Richard Leibner, told us last week that his client "expects to remain on the program" and denied stories, current in Manhattan, that he has shopped her to other networks in recent weeks . . .

Forrest Sawyer, her coanchor, would reportedly continue on the show, handling the news blocks on the half hour and celebrity interviews, while perhaps returning to the "Early Morning News" as anchor . . .

Faith Daniels, as we mentioned before, could be headed for "CBS Evening News" eventually, while Shriver could conceivably return to KCBS if she'd like . . .

From what we can hear, none of the three -- Shriver, Sawyer or Daniels -- is being faulted for performances on "Morning News" (Sawyer has been impressive in his network news anchor appearances) . . .

But the fact remains the Nielsen ratings for the morning show have been sitting there at around 3.0 -- a full two points behind NBC and ABC rivals -- ever since they moved in late last summer as a team . . .

Winston may or may not have the power to make a clean sweep (with CBS News President Van Gordon Sauter's okay, that is) of the current staff, but she's apparently going to make a try at it to wake up the sleepy ratings . . .

Meanwhile, Pete Bonventre, brought in a few months ago as a senior producer in charge of planning and special projects for "Morning News," has quit, the first major defection since Winston took over . . .

The story favored at "Morning News" is that "I Never Played the Game," which Bonventre coauthored with Howard Cosell, contained an unflattering reference to Winston, who was executive producer at "GMA" until mid-1984, and Bonventre decided it was time to move on when she moved in . . .

Whether true or not, he's reportedly made a bundle with his share of the book proceeds and can afford a break right now regardless . . .

CBS puts on its spring show for the affiliates this week out in Los Angeles and it will be interesting to see if there are any current stars from "Morning News" paraded out there during the News division's presentations . . .

Linda Ellerbee's future at NBC News may be a teensy bit cloudy right now but she's doing just fine with her new book recounting her TV experiences -- "And So It Goes" . . .

Film producer Bernie ("Ghostbusters") Brillstein and actress Marsha Mason have optioned the book as the basis for a film and a musical. Ellerbee would write the film script. Brillstein just signed a deal with Lorimar-Telepictures to form an autonomous entertainment and management unit . . .

Dom DeLuise weighs 300 pounds . . .

Through last Thursday, NBC was comfortably ahead in the primetime ratings for the May sweeps, with good numbers still expected from its "On Wings of Eagles" mini-series . . .

ABC, after "North and South: Book II," was a distant second but still ahead of CBS, which was yet to count the finale of "Dallas" last Friday and Thursday's upcoming conclusion of "Falcon Crest" . . . Lots More Dots

The Corporation for Public Broadcasting board Friday voted $1 million to help PBS stations promote their programs . . .

That was part of a budget totaling a revised figure of $219.7 million finally passed by the board . . .

Meanwhile, erstwhile CPB board chairman Sonia Landau, whose term expired in March although President Reagan has announced he will renominate her and former vice chairman Kenneth Towery, told a reporter she believes Sen. Jay Rockefeller (D-W. Va.), a member of the Commerce, Science and Transportation Committee and the husband of board member Sharon Percy Rockefeller, is blocking her confirmation . . .

Ira Shapiro, the senator's chief of staff, disagreed. He said Rockefeller is opposed to the nomination and plans to vote against it, but that "he is in no way blocking or delaying consideration of the nomination and he doesn't favor such a delay" . . .

Landau replaced Sharon Rockefeller as chairman of the CPB board a year and a half ago and the two are bitter opponents . . .

ABC News will air another "Viewpoint" news special the night of Thursday, May 29, starting at 11:30 p.m. . . .

Ted Koppel will anchor "The Manipulators: Iron Curtain-Stone Wall-Party Line" before a live audience at Vanderbilt University in Nashville. Network executives and perhaps a Soviet spokesman are expected to join Koppel . . .

The 90-minute program will focus on terrorism and the nuclear accident at Chernobyl in a discussion of whether the media manipulates events or is manipulated . . .

And from our Better Late Than Never file: With Buck Owens leaving the syndicated "Hee-Haw," Loretta Lynn, Alabama, Reba McIntire and Ricky Skaggs will take turns hosting the country music show with Roy Clark next season . . .

Channel 26 will make a day of it June 2, when TV coverage of Senate floor proceedings goes public for a brief trial. WETA will air a special from 2 to 6 p.m. that day plus a one-hour special at 11 p.m. tracing the history of the Senate, taped highlights of the day and examples of TV proceedings in other countries . . .

Paul Duke will anchor the programs with help from Gloria Borger of Newsweek and other experts . . .

Lane Venardos' last watch as executive producer of "CBS Evening News With Dan Rather" was smooth sailing as the show easily won the weekly network news race with an 11.6 Nielsen rating and a 24 percent audience share, compared with a 10.3/22 for "NBC Nightly News With Tom Brokaw" and a 9.6/20 for "ABC World News With Peter Jennings" . . .

A week ago, Venardos relinquished the con in favor of Tom Bettag, who had been his senior broadcast producer. Venardos was named executive producer and deputy director of CBS News' special events unit . . .

According to our sources, that was the job Venardos was headed for two years ago when he was tagged for the "Evening News" job. Last summer and again in January, he sought to leave the nightly grind but the turmoil within the Division (folks were getting fired all around) prevented his move at that time . . .

Meanwhile, Special Events, under Joan Richman, has been very busy of late and the need to give her help (she's been putting in 24-hour days recently) became pressing . . .

Rather says the well-liked Venardos can have his old job back anytime he wants it . . .