I haven't had any indication that they would at this point, though biometrics are being used right now by the United States for non-U.S. citizens when they enter at ports of entry. There's a camera. They take their picture and fingerprints.
Biometrics are very important to the United States. We're starting to use them, but I don't have any indication that they are part of the ESTA program or will be part of the ESTA program any time soon.