Real Time Economics, the Wall Street Journal blog, reports:

U.S. Treasury Secretary Timothy Geithner and Federal Reserve Chairman Ben Bernanke on Wednesday unveiled a new $100 bill that is equipped with two new security features.
The bill will go into circulation on Feb. 11, 2011.

Here is what it looks like:

http://online.wsj.com/media/new100_cs_20100421102124.jpg