I am on the Ford racing mailing list and found this in my inbox. They took three 2015 Mustangs, an Ecoboost, a 5.0 GT and a prototype Roush supercharged 5.0 and challenged them to be the first cars in the 12's, 11's and 10's respectively. It was a great video to watch. I listed a few things I noticed below.
1) They are all on racing slicks
2) The 2.3 looks a bit slow out of the gate but picks up speed nicely. It does however sound like a Honda when it bounces off the rev limiter.
3) The suspension looks on the softer side for all three cars. There is a whole lot of squat when the cars launch.
4) The new IRS system seems to lay the power down nicely. However, when listing the upgrades, I saw two important installs. One was a "PERFORMANCE REAR SUBFRAME KIT" and the other was a "HEAVY DUTY HALF SHAFT KIT"
The reason I capitalized these installs is that for the primarily drag racing happy following the Mustang has, it means added upgrades before you can add slicks and go racing. I'm also concerned for those who run drag radials as they may be towing the line between going racing and going home on a flatbed.
While I don't think Ford was stupid enough to sell a Mustang that can't handle some track passes, the fact that they added these upgrades on the lightly upgraded NA 5.0 tells me there is definitely a limit to the power that stock rear end can take. Assuming the supercharged 5.0 makes the same 624 hp flywheel that the current Roush designed Ford Racing supercharger puts out now, and it requires the upgrades, it means that the subframe upgrades are not just for the guys making top power, but even the mid-level guys. If that is truly the case, then it was a huge oversight by Ford.
Anyway. I thought the video was a cool way to show that they are not just leaving the upgrades to third party companies. On a side note, 12.56 for the ecoboost is impressive.