In September, I took delivery of a 2013 E92 coupe. It is my understanding from the dealer that BMW is targeting July of 2013 for the F32 coupe.
However, if X-drive is important, that drive-train may not be available until January of 2014 or perhaps even later.
Concerning cost, I was offered identical E92 coupes (in a desirable color combination jet black/saddle) for the following: $1500 UNDER invoice for the 2012 and $1100 OVER invoice for the 2013. If you are willing to take an odd combination (red/cream interior) in a 2012, I have seen the prices of those coupes down around 2500 under invoice. 2013 E92s do not appear to be receiving "end of body style price" treatment-- and likely won't until the F32 is officially announced and arriving on dealer lots.
I didn't want to be a guinea-pig for the new 4 banger engine. And, since I have to differentiate the F30s from the E90s (post LCI) by either 1. seeing that pop-up nav screen or 2. the grey bottom of the back bumper I don't imagine the coupe to be "instantly outdated" in the looks department.
My biggest regret in choosing this generation over waiting is the second shaved off to 60 and the +6 mpg in city driving.