The ACS is taking a conservative view, and has only re-emphasized the importance of discussing screening with your doctor. Other than that, their recommendations are unchanged.
See their press release on this issue:
http://www.cancer.org/docroot/MED/content/MED_2_1x_American_Cancer_Society_Stands_by_Its_Screening_Guidelines_Women_Encouraged_to_Continue_Getting_Mammograms.asp