I do not have any information about beta results for 71-646 and 71-647!!!
The live versions are due out in a few weeks (if you want to know exactly when, sign up here), and as far as I know no beta results have been posted yet. Hopefully they'll be published sometime before the first week of April when the exams go live. If you must know immediately, check with Prometric daily to see if they have posted results yet (I do not think that seems very fun), or watch this post (I'm sure someone else will be checking daily and let us know when results start to show).
I hope you passed.