Jason,
I have seen the changes and they are very well done. The greens are fun, and still have plenty of slope, that allow for shot making opportunities beyond just aerial assault.
To clear up a few misnomers. Thankfully, The 18th green has not been moved. There may have been a tee (or two) added, but I can't say that definitively, because I never saw all them to begin with. We did play a tee directly behind the 17th green, which looked newish. It was benched into the hillside and was pretty cool and challenging.
Some of the holes are totally different, in look, mostly because of the green sites alterations. One of the routing issues, I recall initially feeling, has apparently been fixed. I recall that it initially involved zipping around a corner, with the first green within ear shot.
The 13th has a new green that is not yet in play. It is left of the current green and looks almost table top like. The 13th also has a new fairway LZ, left, which is also in grow in, which might provide a skyline affect to the new green.
The native has been cut down to a playable height, farther out, allowing for recovery, throughout.
Overall, the course was enjoyable to play, the accommodations terrific, food fantastic and the staff was welcoming and friendly. Many are now local Nebraskans. Go figure.