Someone throws out a rumor and everyone's gonna get on board and freak out about the cut being at 56 ... -15? Low scores will be dependent on wind directions. There are alot of long par 4's and many elevated greens. If the cutline goes down to 57 (which is -14) I'd be pleasantly surprised. Some wicked greens too, and will be even more wicked on championship speed, which I expect will be the green speed for the qualifier.
Historically, I can remember the cutline predictions for Merion and Pinehurst being 55 and 56 ... neither of them went that low. And neither of them have the long shots to high elevations that this course has. I wasn't here when the Olympic course was first featured, so I don't know what the predictions were. Likely they were lower than the cutline actually was.
Other things to consider ... in big headwinds you're only going to reach one par 5 in two. Two of the par 3's are difficult with the long downhill drop. With a big headwind you'll not easily reach the first hole. With a big tailwind you'll not easily stop a shot close on #1. Headwind or tailwind is difficult to stop a shot on #6. Headwind and you've got over 50 foot elevation on #7.
Cutline most likely at -13 ... like the last two years and maybe the third ...