Rich, I agree with you that the reason for these changes has to do with high traffic volumes -- at least that's what I was told, too. But I also understand that they are doing a bit of re-shaping work (at least on the 10th, to change the way water sheds from the putting surface), and they are completely stripping the greens (again, at least the 10th, which I witnessed) of its sod and will hydro-seed. I guess I would call that a renovation but semantics aside, it is still very disappointing with a course that should be a little further along in its maturity. I'm not sure that Chambers Bay has gone through a full year since it opened without closing at least one of its green sites for a significant period of time.
Greg, I love the fact that Chambers Bay is all fescue, but you may well be right about the choice of grass for the putting surface. I will say, though, that the greens yesterday (aside from those that are closed) are in about the best shape I've seen them.