With apologies to those who've not played there and can't visualize my references.
I did a thread on this just about a year ago (same title). Nothing has really changed (except for #13 green) so those looking for greater detail can locate that thread if they wish.
Observations/opinions:
First, if there were any trees left on the interior of the golf course before this year, they're all gone now. It is really, really neat to be able to see so many different holes from the road and from certain vantage points on the golf course. The view of the entire 4th green complex from the top of the 2nd fairway is really quite spectacular. From a playability perspective, the wind is even more of a factor on #'s 3 and (especially) 4 since that valley between the 2 holes is now wide open. #11 is the only hole that's easier as a result of all this as you can find and play a hooked tee shot now. Bottom line = the controversial tree removal project has, IMO, been a smashing success.
Second, the newly rediscovered putting surface on the right of #13 green, despite what Tom Paul asserts, is not only pin-able, it's actually a fairly benign hole location. The reasons are that 1) the green surface doesn't really fall off towards the right bunkers at the edges so putting into them isn't a worry and 2) there is a slight depression that slows down any back-to-front putt which is the really scary part of the rest of that green. From the tee box, a flagstick over there appears more severe than it really is as it's probably not wise to try and hit it close there but it's not the worst part of the green to putt towards.
Third, and most important from a golf architecture perspective, THE REALLY HARD AND FAST CONDITIONS MAKE THE FAIRWAYS PLAY MUCH MORE NARROW THAN BEFORE. IT'S CLEAR THAT THE TRUE GENIUS OF NATIONAL'S DESIGN IS A FUNCTION OF 30+ YARDS OF ROLL OFF THE TEE. In 2005, the course was set up almost as it must have been before the automated watering system was installed in the 1960's. That maintenance meld has been continued this year and I can't emphasize enough how much easier it is to drive it through the fairway or off the sides if a well struck drive isn't also precisely aimed - and I MEAN "precisely". #'s 1, 3, 8, 9, 10, 11, 14, 15, and 17 are much more difficult driving holes than before despite the seemingly gigantic expanses of short grass in front of you. Basically, the damn ball will bounce all over the place and you better play for it. I can only imagine the challenge pre-1930 with totally baked out conditions plus the small 1.62 ball.
Fourth, there is a new tee box on #15 that is about 20 yards behind and to the left of the (now) old championship location. Because of the angle, the new markers encourage a draw - bad news for we chronic slicers.
BTW, the tee box on #18 on the far side of the driveway has been abandoned and is no longer maintained. It made the hole play longer but the tee shot was easier from that angle.
All-in-all, the faster the course plays, the more important it becomes to really control the tee shot - even on the widest fairways.