I'm very grateful that finally someone did make some effort to clear things up (Thanks Pete), however the way it was worded is pretty confusing.... We'll know in a week or two though.
They said that armor will be one piece in the inventory, but still separate pieces on the body. Just another way to reduce clutter/encumberment imo
Think of it like this:
You still get the weight penalty if you have pieces of armor A1 and Armor B1 and Armor C1
If you have half or full of Armor A1, it "fuses" because it is the same armor, reducing encumberment.
same thing with Armor B1 and C1, but if you have armor pieces that are not alike, you get the weight penalty.