Slight? I can't even tell from the pictures that we actually are dealing with an "all-new" chassis. It's proportions seem so similar. I expected a revolutionary design change, not an evolutionary change. I really liked some of the concepts that were floated, and thought we'd end up with a much smaller proportioned sportscar-ish Mustang.
I guess, based on the article, that they basically took the current chassis, slapped in IRS, noticed some suspension geometry problems, and solved them by widening the rear track. It just seems like the focus was to improve the quality of IRS in the mustang, and to reshape body panels and the roof line.
Don't see anything interesting in the drivetrain, either. I'd frankly have the less technologically complex, cheaper, and probably more reliable V6 than the ecoboost. The talk of a serious bump in power output from the 5.0 had me pretty excited. I discounted the likelihood of getting 500hp from a GT, but thought a bump to 460 was possible.
The pics below are what really had me excited about the 2015, and because the actual design doesn't look so spectacular, I'm disappointed overall. I like the current design, and because it's so similar, I guess I will still like the car, but I don't see owning one.