Some of the build reports for 2017Q1 are hitting the mailing lists.
Quote:
Thu, 30 Mar 2017
18:38 pkgsrc-2017Q1 NetBSD 6.0/x86_64 2017-03-30 05:31 (0) Manuel Bouyer
14:12 pkgsrc-2017Q1 NetBSD 6.0/i386 2017-03-30 05:34 (0) Manuel Bouyer
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From the looks of it 6.0 seems to be the initial build platform.