Paper Clip Boy,
I read something on this when I was researching my issue, i.e. the topic of this thread, but can't remember.
The answer to your question depends on the wiring harness of the 2011-11 models. The 2012 has the necessary wiring already in house, whereas since the option was heretofore unavailable the harness may not support a retrofit of the heated grips. A trip to your local dealer and the parts department, should get you a pic of the wiring harness on your bike vis-a-vis the heated grips.