The Chambers Bay website is now publishing a regular feature on preparations for upcoming US Amateur (2010) and US Open (2015).
http://www.chambersbaygolf.com/layout10.asp?id=173&page=5507Interesting nuggets:
-New tees on holes 1, 3, 4, 6, 10, 11, 15, and 17
-Rebuilding many of the sand bunkers to develop and maintain the "Tillinghast-like bunker edges" envisioned by RTJII
-Enlarging the green of hole 15
-Removing noxious and invasive broadleaf weeds in dunes as well as planting new fine fescue turf to cover dunes where planting has been sparse.
-During the Championships, holes 13 and 18 will both be played as par 4s.