Occasionally, there are reports about src.rpms which fail to rebuild for x86_64, e.g. Gtkmm 2: https://bugzilla.fedora.us/show_bug.cgi?id=1421 To know whether a version upgrade fixes this, requires that someone with an AMD64 system attempts at rebuilding it prior to release. Else the release process looks like QA for x86 -> PUBLISH for x86 -> bug report about x86_64 -> fix and prepare update -> QA for x86 (regression testing) -> if fix needs modifications, try on x86_64 again -> PUBLISH for x86 and x86_64 and results in increased work for the packagers and reviewers. If there are people from the Fedora for AMD64 community who read this, please join and help!
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