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The ordering page now shows December delivery.


Model X body in white (BIW) is being built on the new BIW production line, while Model S bodies are being built on the old (existing) BIW line. After MX and MS bodies are built on the separate lines, they go into paointing and into a common final assembly line, at which point interiors, glass, battery and drivetrain, among other things are assembled into the painted bodies of MS and MX.
 
I doubt X production has much to do with it - Tesla made quite clear that model S production was ramped up in overdrive this past month or so to deliver as many cars before the end of the fiscal quarter this month - now that that's over I suspect production is just easing back into the normal swing of things.