Is the appraisal system changing?

[Steve V]

I was told that lenders will no longer be able to choose the appraiser or give the appraiser a copy of the sales contract prior to the appraisal. My understanding is that when a lender needs an appraisal they would request one from a random pool that would then appraise the property without knowledge of the pending offer. Can anyone confirm this? If so when does this go into effect?