Meryl Streep is barely seen at all in the first-look footage of the sequel, sub-titled Here We Go Again.
And when her pals, played by Christine Baranski and Julie Walters, are seen; they’re with Amanda Seyfried – not Streep.
With characters’ dialogue seemingly open to interpretation, has Donna died?
Fans are certainly very worried that this may be the case – and Twitter has been awash with panic.
“Ok, who do I speak to about cancelling 2018? Meryl Streep has died in Mamma Mia 2. Tell Kim Jong-un to press the button,” one person said.
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“#MammaMia2 so is Meryl Streep not in it? DID DONNA DIE????? Don’t do this to me guys,” raged another.
A third wrote: “Wake me up when someone from the mamma mia 2 crew confirms the trailer was poorly made and Donna is obviously alive.”
Tweeting the film’s verified account, another fan said: “Why on earth did you kill off Donna?!?! She was the best part of the movie… We waited 10 years for a sequel, only for this to happen, I’m inconsolable. #MammaMia2.”
Streep is credited as being in the film’s cast, so she must appear at some point – even if in some kind of spiritual or flashback capacity.
And her character Donna does feature hugely: Lily James plays her younger self.
Mamma Mia 2 is out on July 20, 2018.