It took a bit of staring at the lines on the car for me to decide if I liked it while I was at the CLE Auto show, but it's definitely grown on me. I'm curious about the IRS setup, I've had fox bodies, sn197, and sn95 cars with the live axel, and drove a couple 03/04 Cobras with the irs. Didn't really care to much for it in those cars, but that was more of an adapted IRS.
I think one thing to point out is this will be the first year the Mustang becomes a global car, and that plays into styling as well. I worked in the engineering dept for Honda for 9 yrs, and while I worked in a durability and quality group I knew many of the designers, as for honda/acura products there was always a different styling goals based on the market the vehicle was going to be sold in. Global cars are PITA.
It will be interesting once all the details are released, I've read line lock will be in the track apps, the 2.3EB, 5.0, 3.7, and potential for the 3.5EB from SHO. I'd love to see a 5.0Twin Turbo EB setup for a Mach 1 version but that's just me.