Looks like the mustang changed their minds concerning the importance of weight reduction... Ford is making sure they are ready when the 2016 C6 camaro with the new alpha platform arrives. According to edmunds, Mustang decided to go on a 400lb diet. With the v6 near 3600lbs and the v8 close to 3700lbs. This should put them at around 3200 and 3300lbs. Which is an estimated 100-150lbs LIGHTER than the expectations of the alpha/camaro. Read the edmunds article.
2015 Ford Mustang Goes on a Diet | Edmunds.com
Gotta love the muscle car wars!!! 