I spoke to my dealer earlier this afternoon and he confirmed that F31's are being built in under 3 weeks at the moment, only longer if you want the aluminium hexagon effect trim, or items from the Individual range.
2016 BMW 340i .. on order
2014 Lexus NX .. soon to be gone
2012 BMW 330d .. gone
2009 MB C250 .. gone
2005 Ford Mondeo ST .. gone