Unsurprisingly, I Passed 70-458 two week ago. The structure and timing of this exam are quite similar with the ones of 70-457; 2 sections again. One is from Admin and the other is BI (totally SQL2012 SSIS).
I missed fewer questions this time perhaps because I prepared the exam a little longer time than last time–7 days. Two are missed in admin section and one missed in BI.