It's the computer-adaptive version. You take the test at terminals and the computer generates questions based on your response to the previous question. You get it wrong, it gives you an easier question and vice versa. I think it's supposed to yield a more accurate representation of your skills. I'm not sure, but my understanding was that they were slowly phasing out the paper administrations of the test.
I think it's just a few new question types, not a complete overhaul. At least that's what Google told me.