I think I'll wait until they have any issues from the new platform sorted out and it's gone through its first styling refresh after having been on the market a few years (not that I don't like it, but just like with the SN-95 and S197 it stands to evolve over time).
I bet the incentives/discounts get better over time, too, on a car that I am sure will have a list price that's not insignificantly higher than the current model.
So, maybe I won't actually wait until mine dies, but I am going to hold out for a bit.
Black 2013 Mustang 5.0 MT82 w/401A package and 3.31s
Black 2000 Mustang GT (owned 2001-2013, sold at 177,000 miles)
Brown 1971 Triumph TR6