Hi everyone--
I'm going to be MIA for most of the day today (and likely for a couple of days). We've got some cool stuff going on right now... https://media.ford.com/content/fordmedia/fna/us/en/news/2014/08/28/2015-mustang-flat-rock-assembly.html
Anyways, please keep in mind that if I have...
Does this help at all? General overviews: https://media.ford.com/content/fordmedia/fna/us/en/news/2014/08/12/even-music-sounds-better-in-the-2015-ford-mustang.html
http://www.ford.com/cars/mustang/features/#page=Feature23
The seat backs have "memory recline," so when the seat backs are folded forward, they return to the angle they were at previously when they are pushed backwards.
All Mustangs will be built at Flat Rock Assembly Plant in Michigan.
As for the remainder of your questions, I really can't say. I'm on the PR team in the US, thus, am not too familiar with the sale date in Europe.
Ride height remains the same, but there are a ton of changes made to the suspension system (stiffer springs, different shock tuning, different alignment, etc.) and chassis (increased bracing for improved body stiffness).
I can't say anything about drive impressions, but the media will be in cars and reporting on their impressions right around the time-frame that you mention.