rulesdontapply:
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If the 991 will be presented in Frankfurt in September, then Porsche will start production of the vehicle around June or July [taking the factory upgrades into consideration] after they stop production of the current 997 models. This seems more appropriate, since Geneva is barely a month and a bit away and Zuffenhausen is still pushing 997s out.
rulesdontapply
This is actually an interesting story. According to press reports, the official introduction of the 991 is going to be at the Frankfurt Autoshow in September but according to our sources, first cars will be at german dealers around June/July, before the Autoshow. This is actual the usual time frame for new 911 introductions.
So if the 991 is going to be delivered to dealers over here around June/July, the pre-production should start around...now.
What many people don't know: Porsche can build the 997 and the 991 on the same production line, just how they please. So expect the 991 introduction shortly after 997 Black Edition production finishes, earliest in May 2011, latest in July 2011.
I also think that the official announcement regarding the 991 will be in March, latest early April.
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RC (Germany) - Rennteam Editor Porsche 997 Turbo, BMW X5 M, BMW M3 Cab DKG, Mini Cooper S JCW