@narnian78 , @courtenay

Well, it could go either way- multi-episode or stretching a short story for film. 

I would be alright with some additions if it could really add to the story, as long as it’s not too distracting. There are things that a movie or series could do that a book wouldn’t be able to do-

LWW could cut back and forth between Edmund with the White Witch and the three other Pevensie children with the Beavers as well as between the girls with Aslan and the boys at the battle (not as huge and epic as the Walden film though we might see a glimpse of what the boys are up to)

PC could cut back and forth between the boys are with Caspian and the old Narnians fighting the Telmarines and the girls are with Aslan as he’s freeing the school children. 

HHB could cut back and forth between Shasta with the Narnians and at the tombs and Aravis with Lasaraleen overhearing Rabadash planning to invade Narnia. 

Even in LB, we could see Poggin overhearing Rishda and Ginger (silhouettes of those two characters could make it really dramatic) as well as Tirian being tied up to a tree, remembering what has happened in Narnia’s past. 

There are things that could be done in a movie or series that would otherwise be too tedious in a book. 

They barely did anything with the giant characters in Walden Media's Narnia movies. I'd like to see more of them in new adaptations but I'm guessing there were practical reasons for not doing much with them in the old ones so not much hope of that changing.

I believe they also didn't include any wraiths, horrors or specters in the White Witch's army, probably because they couldn't figure out how the good guys could kill ghosts who are presumably already dead. (I distinctly remember the BBC miniseries showing a ghost explode when it got shot by an arrow.) I wonder if stage productions of The Lion, the Witch and the Wardrobe typically include them. I suspect not since such beings are probably lend themselves more to cinematic special effects but it's possible to do them well onstage with good ghostly looking makeup. Maybe a new LWW adaptation could take the White Witch's forces in a more ghostly direction whereas the 2005 one made them more solid. (I can't think of a better way to word that sentence right now. )

@col-klink 

Yes, having the animated figures who worked for the White Witch fighting against Aslan’s forces did not work very well in the BBC production.  They did have more realistic battles in the Walden films, although the scenes were much longer than in the book.  I think today there is more of an effort to show things with more realism on the screen.  The special effects might be more than Lewis intended,  but often that is the way today’s movies and television shows are made.