Some posts on 2 Series LCI seem to indicate MY2018 which would probably have a SOP of 07/17. They may have said in 2017.
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'74 2002tii, Sienna Braun Metallic, Manual, Sold; '84 e28 533i, Burgundrot Metallic, Manual, Sold; '95 e36 M3, Avus Blau Metallic, Manual, Sold; '06 e60 M5, Silver Grau Metallic, SMG, Sold; '09 e82 135i MSport, LeMans Blue, Manual, Sold