Harding Park has started course preparation for the 2020 PGA. There are new tees on #2 (+15 yards to 455), #8 (+20 to 250), and #13 (+40 to 470). These are all estimates. As of now the tournament yardage would be about 7,230 yards, par 70. I'm not sure if more tees will be added.
Every fairway has been narrowed on one or both sides. The widths we measured were consistent at 22-23 yards. It appears that fairway will be mown around all the bunkers—not just into, but around. These lines linked to the fairway lines, so we all agreed they looked to be future fairway and not future semi-rough:
Here are a few views. The new rough hasn't really grown up yet, but you can clearly see the new fairway lines.
1:
2:
4:
#7 (the narrowest, about 21 yards):
#13. This new tee might create some issues. The tree is very much in the line of play and it's too tall to go over.
#14:
#16:
#18—fewer trees in front of the fairway than 10 years ago, and the you can see might not make it through to the PGA. It's an issue for me, though probably not for many of the big name players.