There was a long list of provisions that were going to expire on December 31, 2012. Given the huge political mess the last couple weeks, these may have gotten lost in the shuffle. But, instead they were preserved, largely with language in the bill which substituted "December 31, 2013" for the existing expiration dates.
What's important on VisForVoltage is that the electric motorcycle tax credit was extended.
Detailed report here: https://www.jct.gov/publications.html?func=startdown&id=4497