I just want to know what law has changed to disallow it I got it for my truck purchased in 2010
You can go for it. If you haven't yet, you should before the end of the year. They haven't issued a final ruling yet but odd's are you're going to get to keep it.
Btw, I hope that any of you that claimed the credit don't bitch about welfare abusers. I understand it'd be tough to turn it down, but you're really on the same side of those that exploit faulty Govt programs.