Looking at the roof of the Toronto dugout, it looks to me like the texture is higher quality than 15. I compared as best as I could and what I noticed is that the 15 version's texture looks flat while 16's texture has this little marks in it. It's more... "textury."
The trailer is on YouTube and this is not great for picking out details like this, but I wonder if we're going to see higher quality textures all around.
I can't get the correct angle during replays but here's 15 for comparison.
15 looks like a pasted on image while 16's logo looks more like a material overlaid on the dugout's roof.