First - let me be perfectly clear - the new U.S. government regulation does NOT enact an outright ban on 100 watt incandescent bulbs beginning January 1, 2012.
HOWEVER, as of January 1, 2012:
So, while there is no ban, the effect will be the same in the long run.
See the article "Is There a Ban on Incandescent Light Bulbs?" to find out more, including:
As the supply becomes more and more scarce, the price for 100 watt incandescent bulbs is sure to rise. I do believe it has risen a little bit already. Eventually . . . they will simply be unavailable.