The new $100 bill

Reports has it that the new high-tech $100 dollar note will be made available in the hands of every American starting October 8, Fed said Wednesday.. The new $100 bill has new features that makes it so different from the old, thereby helping retailers to identify counterfeit ones.
Benjamin Franklin image is still on the new $100 bill, except for a few added security features such as a blue ribbon woven with image of a bell and a ''big'' $100 that is able to change from copper to green when tilted back and fort.
When the new $100 note is out, FED says you cannot trade with old ones anymore.
Why the change? the $100 is the most counterfeited of all U.S currencies.