The first of these is a prequel series set in Poplar during World War II, which is being produced for the BBC and is set to air next year.
All of these projects are being written and produced by creator Heidi Thomas and executive producers Pippa Harris and Ann Tricklebank, with season 16 of the main show also in the works.
"I have never run out of stories for our midwives, and I never will. But having wept, laughed, and raged my way from 1957 to 1971, I found myself yearning to delve into the deeper past.
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"The Blitz years in the East End were extraordinary – filled with loss, togetherness, courage and joy. The bombs fell, the babies kept on coming, and the Sisters kept on going. There will be so much in the prequel for our wonderful, loyal fans, including the appearance of some familiar (if much younger!) faces.
"The rise in hospital births, and changes in the NHS, have clipped their wings, and this is their chance to take flight and work out what really matters. Whilst the location of the film remains top-secret, I can say it is going to look absolutely fantastic on the big screen!"
"As the Christmas action shifts between the sun-drenched Far East and a snowy East End, Sister Julienne suddenly finds herself excited about the Order’s future. After years of battling change, she decides to embrace it, work with it, and see what love can do. This change of energy reverberates throughout series 15.
"The new series kicks off in 1971 with several of the ladies embracing Women’s Lib and burning their bras outside Nonnatus House. As the year unfolds, we see the team handle cases including premature birth, placenta previa, kidney cancer, tuberculosis and slavery."
Earlier this year, when speaking with Radio Times magazine, Thomas did tease that "we do see opportunities to expand our storytelling world", but also suggested the show "might take a break at some point" – something that thankfully isn't happening any time soon.
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