M2 is 9 Months from Production. Specs Locked In?

As the title suggests, anyone know how far along the M2 really is (aside from the obvious in the proto and earlier mule pics)? Curious for feedback from anyone with engineering experience or insight into the process. Is the car now locked in in terms of design, specs, options, etc? Specific example...we've not seen a CF roof yet either by design (they'll spring it on us) or omission (because it's too late to engineer this feature in, or too costly to engineer in).



Any thoughts??