Richard Jackson, currently editor of the late afternoon show Drive, is set to take over as editor of Breakfast. The flagship morning programme will be relaunched in January with new co-presenter Nicky Campbell.
Rhian Roberts, currently editor of Fi Glover's late night show, will transfer to Campbell's mid-morning three-hour slot before Glover takes it over. Roberts replaces John Zilcha, who becomes editor of Drive.
All the moves will happen 'within weeks', according to the station's head of news, Ceri Thomas.
He told PRWeek that a review of content and format on all strands is now underway: 'It would be odd if we didn't use the opportunity to ask the question whether the way we've done things thus far is the way we should. Should there be some changes to formats? What kind of stories are of interest?'
But he added: 'If you look at the last Rajar figures, when all news programmes did well, it doesn't demand instant revolutionary change.'
No announcement has been made on the format for the replacement for Sunday Service, the station's Sunday morning political round-up.
The as-yet-unnamed new show will be helmed by current Breakfast co-presenter Julian Worricker and PRWeek columnist Charlie Whelan will contribute to it, a BBC spokesperson confirmed.
Matthew Bannister, currently presenting the Weekend News on Saturday and Sunday nights, will take over Glover's Monday to Thursday 10pm to 1am slot.
Richard Evans will present Bannister's old show, and the station is looking for a replacement on it for Caroline Feraday, who is moving to London station LBC. The programme is produced by Paul O'Keeffe.
Rod Liddle, who is yet to be replaced as editor of BBC Radio 4's Today - which he was forced to quit last month after writing a controversial column in The Guardian - will do holiday cover for Glover's show until the new year.