Wink, 8 weeks is the standard time and what the dealer most always says. Mine took 13 weeks but was no where near the longest go read the Ordered a 13 Stang thread.
I waited 6 months for my '06 which was originally ordered as an '05. BUT the S197 body style was the most popular of all cars on the road when they came out. Mustang sales have fizzled since then. Hence, a rumored new look coming for 2015.