I seem to recall SSC announcing them last time around, so you're already on the list 🙂

Theoretically none of the answers should be wrong on the beta exam. The test has already gone through a few revisions and reviews by that point. The goal of the beta exam is not to test correctness, but rather to ensure that questions are phrased properly such that most qualified candidates will be able to answer them, but so that they're not too easy. MS takes all of the answers from all of the beta test takers and focuses on the questions that the least number of people got the correct answers for, and the questions that the most number of people got the correct answers for. These are evaluated to determine whether they should be rewritten. Perhaps a few incorrect answers are found and weeded out at that point, but it should be rare.