It's amusing to me that the most controversial quote/interview from the production in the past two years turned into a giant nothing. I am looking forward to having more concrete details soon worthy of controversy  

I assumed she meant it in the slang definition. Like when someone sees something cool and they say, "Oh, that's so punk rock!" Or they see something intense and they say, "Oh, that was so metal!" In this case, she probably means Greta's vision for the film is modern, hip, maybe a little edgy and/or risky, in a way that Amy Pascal likes.

And....here we are with scenes being filmed set in the mid 1950s. We wait for the rock & roll, knowing it's slightly too early, but wondering what Amy Pascal really meant.

@coracle According to Wikipedia at least, rock and roll "evolved in the United States during the late 1940s and early 1950s", but "did not acquire its name until 1954." So 1955 is JUST within the period where we could be talking literally about rock and roll, although I don't know how long it took for both the style and the name to become well known over the other side of the Atlantic...  

So really there is some potential for a little rock 'n' roll... at least playing in the background. Was Amy giving us a big clue about the setting, after all? 😮

On the question of 'could it be a musical?'
The likelihood would partly depend on the cast and their experience with singing.

David McKenna has performed in a lot of musical theatre and almost certainly would be capable in a Musical movie.

I couldn't find out anything on Beatrice Campbell.

No information on Emma Mackie singing in a movie - though she has a nice voice in this video: Emma Mackie Singing

Apparently Daniel Craig sang in a deleted scene for "Dear Frankie", but the only clip I could find of him singing is this one: Knives Out singing. (If this is the quality of his singing, then I hope Uncle Andrew does not sing! )

Carey Mulligan has sung in: "Inside Llewyn Davis", "Far from the Madding Crowd", "Shame" and "The Ballad of Wallis Island". See Carey Mulligan singing

Meryl Streep sang in "Mamma Mia", "The Prom", A Prairie Home Companion", "Only Murders in the Building", etc. You can watch 20 minutes of her singing on Youtube: Meryl Streep singing

Edit: And looking at almost any random actor and checking if they have done some singing on screen, it seems about 80% of them have at some point. 

So, from all of that, I think it is possible that this cast could do a musical (though I am leaning towards 'It is not likely').

Posted by: @courtenay

@coracle According to Wikipedia at least, rock and roll "evolved in the United States during the late 1940s and early 1950s", but "did not acquire its name until 1954." So 1955 is JUST within the period where we could be talking literally about rock and roll, although I don't know how long it took for both the style and the name to become well known over the other side of the Atlantic...  

As fans of "Back to the Future" will know, Rock N Roll was accidentally invented in 1955 by Marty McFly at a high school in California 😉

@icarus Very good, but I hope that doesn't mean this new version of The Magician's Nephew will replace Fledge the flying horse with a time-travelling DeLorean...  

Maybe slightly controversial,  but I wouldn't mind if the film had a bit of a rock soundtrack. That said, I definitely hope it's not a rock musical. The thought of the Creation Song being a rock number makes me cringe. 

Agreed @glenwit.  Now that it appears MN is most likely to be set in 1955 in our world, some tasteful 1955 "rock and roll" music in the background would be okay IMO also, perhaps in a similar way to "Oh Johnny, Oh Johnny, Oh!" by the Andrews Sisters in Walden Media's LWW.  That said, I don't think it would be tasteful at all if that's what the music in Narnia itself is like - especially when it comes to the most important music to be heard in the Narnia scenes - Aslan and the stars singing.  It should sound other-worldly and magical IMO.

Elvis Presley released his first single in 1954 and at least five others in 1955. He had just as big of an affect on Britain as he did in the States. I'm guessing there's an Elvis song in the movie somewhere.