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Filming will take place in London’s government district of Whitehall; at Pinewood Studios outside the British capital; and on location in Istanbul, Shanghai and the Scottish wilderness.

Early reports that the film would shoot in India and South Africa have not materialized, but the producers insisted they had not trimmed Bond’s budget since “Quantum of Solace,” which was widely reported to have cost roughly $200 million.

“It is in the same range as the last one,” Mr. Wilson said. “We haven’t had to change anything in the script to get what we want.”

Cast members said they had been training hard for their roles — MR. Craig, it seems, by growing the designer stubble he sported at Thursday’s press conference.

Mr. Bardem joked that the hardest part for him was “learning the English vowels.” Miss Harris said she had been  practicing yoga, learning stunt driving and firing machine guns, “which I’ve discovered I have a real taste for.”

Mr. Wilson and co-producer Barbara Broccoli — old hands at building suspense around the movies — kept many details under wraps.

Of the plot, they revealed only that “Bond’s loyalty to M is tested as her past comes back to haunt her” and MI6 comes under attack.

As for the meaning of the title, Ms. Broccoli said it “has some emotional resonance which will be revealed in the film.”

Ms. Broccoli said the producers hoped Mr. Mendes would sign up for a second film and “definitely” wanted Craig to return as Bond.

“Skyfall” is due to be released on Oct 26, 2012, in Britain and Nov. 9 in the United States, 50 years since the release of the first 007 film, “Dr. No.”

There will be no change to one part of the series’s winning formula — attractive women and hunky men. Asked whether Mr. Craig and Mr. Bardem would take their shirts off, Ms. Broccoli sought to reassure fans.

“Damn right,” she said.

“If Barbara gets her way,” Mr. Wilson added, “it’ll be more than just their shirts.”