“I was flying a kite and it got caught on a nanny,” says one of the little Banks children, offering as good an explanation as any for the arrival of the ultimate child-minder in this new trailer for Disney’s Mary Poppins Returns. Directed by Rob Marshall and starring Emily Blunt in the title role, the musical, floating down just before this Christmas, is a sequel to 1964’s Julie Andrews classic, and judging by this trailer seems spot-on in terms of tone and style. There’s even a big, splashy and colorful animation-live action hybrid scene, complete with penguins.