Epic fail.
It's not a new design, it's just thinner. There's no optical drive, which kills it for me. When I use Windows on Bootcamp it means having to have an external optical drive on my desk to load certain programs or play DVD or BD movies in my collection, thus defeating the purpose of having an all-in-one machine. Another external device to add to my modem, external HDD, speakers, etc.
No optical drive
No new stand design
No retina display
No upgradability
No touch screen
No exterior design change (e.g. same chin)
No difference in available sizes
This is essentially little more than a spec bump with a thinner screen. I don't need a thinner screen. The only possible appealing feature is the 75% less reflective AG coating.
FAIL.