What do mean by changed? Did you read this on some website, or did you study a braindump online and when taking the actual exam, found the questions completely different?
Typical MS exams have a large pool of questions, anywhere from 100 - 400. When you take the exam, you get a small percentage of questions from that pool. On this exam, it's like 50 of 200.
If MS did replace the pool of questions for 70-100 (although I wouldn't think they would considering the successor to this exam, 70-300, has been released), I would hope they wouldn't make it public knowledge. Let the braindumpers and cheetsheet.com users of the world learn this fact the hard way.
Jon Hawkins