The revised ADA standards went into effect on 15 March 2011.
According to this story...
D.O.J. Revises Americans With Disabilities Act With Changes Effective This Thursday
http://www.theblaze.com/stories/d-o-j-revises-americans-with-disabilities-act-with-changes-effective-this-thursday/
“Under the guidance of Attorney General Eric Holder, the new ADA rules were signed on July 23, 2010, the official text was published in the Federal Register on September 15, 2010, the regulations went into effect March 15, 2011, and the compliance deadline is set for this Thursday.”