It means that this will be aimed at kids, not adults (= boring). It will have a PG rating, so all the action will be toned down to a few minutes of fun with a Nerf bat. We'll never have to worry about anyone dying because that won't happen. Hard to imagine how any of the main characters will be in any danger at all, tbh.
Remember
Hellboy and
Hellboy II? Nerfed so badly, they didn't even have any blood! People get shot, stabbed, beaten, etc. in all kinds of beautifully stylised ways, but nobody ever bleeds!

And why? Because they wanted to keep the rating low to boost audience volumes. Result: lots of utterly nonsensical action in which fatal wounds are no more messy than a slight bruise.
The original
Tron was a kids' movie and worked well as a kids' movie. It is still one of my all time favourites. I had hoped that the sequel would raise the bar, but apparently not.