I don't have access to the article at the moment as I'm on the road, and VPN doesn't work too well off my 3G modem. From what I gather, the salary cap concept has been in place for quite a while, it's just that the 2012 budget has cut the salary cap by about $20K.
There is a discussion of how the salary cap applies to academic year appointees here:
http://www.research.ucla.edu/ocga/NIH/SalaryCapFaq.htmThe upshot seems to be that your pay rate is capped, and is unlike what happens with NSF with certain programs, where it is more an issue of total salary expenditure, which is addressed by paying you your usual rate, but reducing the effort level.