Brian's has already had the new spec chest protectors for over a year, they're not coming out of nowhere and testing them just now. It's getting grossly exaggerated how much they're trimming the equipment as well, here's an image showing the 2017 old spec protector vs the new spec protector.
I labeled the two areas that are changed, the lower abdomen area looks different because the 2017 model looks like it was photographed on a flat surface and is spread out a bit. There's no changes to the lower portion.
1) They're trimming this part and having it sit closer to the shoulder, there won't be as large of an air pocket as there was previously.
You can see how much it makes the shoulders pop up in this image:
2) There really isn't any reason for this part of the equipment, it's just a wing that pops out and makes the goalie look bigger.
The bigger goaltenders probably won't end up looking much smaller, the tall and small guys like Ryan Miller are going to look a lot more trim.
An injury in the new equipment was probably going to happen in the old equipment too.