Interesting! It would be nice if this article is indicative of a future trend.
Article in Educadtion Week The article rambles a bit (especially at first) but does say the following:
"...there�s no particular incentive to boost the achievement of top performers, many of whom may be hitting the ceiling on their state assessments.
...
Mr. Plucker and co-author Nathan Burroughs said their analysis shows that the now 8-year-old law only continued a trend already under way.
'If we were to blame NCLB, that implies that schools were doing a good job at this before NCLB,� said Mr. Plucker. �I think NCLB is actually irrelevant to this.' "