Here are some pictures from 10 days ago, of some of the current work at Oakmont. The bulk of the activity was around the green on #14, and on the opposite sides of the fairway in the landing zone of #15...
From #14 landing zone, looking at the green
From greenside right, looking back down the fairway
From #10, wide view catching the front edge of the current back tee on #12 (note the Open tee is off the picture to the left), the 14th green and then looking down the 15th fairway at the work being done there
We were participating in a charity event, so we did not have a member host, but the caddies claimed that the work on #14 was for pinching the fescues all the way in towards the green. We saw some obvious bunker drainage going in, so either some new bunkers were going in there as well, or existing ones were being re-plumbed. By the way, the existing back tee on #14 is at 360 yds, and the club's concern was that the green would be driven, thus the work being done. I don't believe that tee can be moved back, as it is already on the top of a hill behind the 13th green
View of the all-world #15 green, looking back up the fairway to the clubhouse
The caddies were not sure whether the re-done area in the left rough (right side of picture) was a true Church Pew or a multi-"toothe" bunker complex. They claimed it was to mirror the grass Pews on the opposite side of the fairway
From middle tee on #18, looking back across the #15 fairway (near-ground), past the work around #14 green, across #12 tee, #10 fairway, to #9 fairway in the distance in front of the tree-line (you can't see the 1st fairway which is right in front of the tree line)
Again #18, but rotated a bit to the right, still catching the work on #15 in the left foreground
Someone mentioned that Oakmont "does not suffer fools". Boy, was that a perfect choice of phrases. I can't imagine trying to play that course on a regular basis as a mid-high HCP'er, even from the proper set of tees. As Jim F mentioned, it was very difficult to execute even the safest-appearing recovery shots from rough that was thick and dense, but not necessarily long. There is no such thing as a tap-in, or gimme putt, as there is so much character to the greens, and they weren't even at "Oakmont" typical speed last week.
Oakmont is an examination, a measuring stick, if you will, for where you are and what kind of grasp you have on your game at that moment. I can't fathom anyone "getting away" with shots at Oakmont, or getting many lucky bounces, and that is why I think it doesn't suffer fools.