24,30,50,60 fps etc... We already have enough fps as it is. 48fps makes no sense to me. Why not 30 or 50 fps? Or better yet enough with the half assing and go straight up 60 or even 120fps.
I fail to see the point in 48 fps. too many fps standards as is. no need to further add anymore than there should be.
/oldmanyellsatcloud rant
The reason they're using 48fps is because it is a perfect double of 24fps. This helps the theatrical release for screens running at 24fps. Studios will use multiples of 24 for filming because it will make theatrical release easier. 24, 48, 72, 96, 120.
When it is time for home video releases, the studio has a 24fps master created from the 48fps source elements. Due to its limited theatrical release and whether they receive negative feedback from consumers, the studio may choose not to release the 48fps version until a point when high frame rates are popular.
In the US, TVs use refresh rates of 60hz. In PAL territories (such as the UK), TVs use refresh rates of 50hz. Primarily you should see these frame rate standards as a divide between TV and movies in their respective histories and technological evolutions.
The nearest intersection you could see between movies, theater screens, and TV sets would be 120fps.