From Nasba:
Due to the substantive changes to the Uniform CPA Examination, effective April 1, 2017, the scores for the candidates who test during the April/May 2017 testing window will be released approximately 10 weeks following the close of the window. The expected score release dates for each section are outlined in the table above.
Because of the changes, time is required to conduct the standard setting process, which includes statistically validating candidate performance and setting a passing score. Anytime the Examination undergoes significant changes, a passing score is set so that the assessment remains legally defensible, which is common practice for a high-stakes examination.