I don't think that's true and I don’t' think sales people get any real info on this.
(which is unfortunate as they are the customer interface)
For October 2010 the Z is set for a minor interior and exterior update.
And in the third quarter of 2013 a major update is scheduled, where it moves to the replacement platform and all items will be updated. (Engine (DI), transmission (currently not scheduled to have a DCT), suspension, interior and exterior)
These are the current plans, of course everything could change if Nissan headquarters decided to change their mind.
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