The CPU is likely to be in one of the 2012 MBA models, whatever it is. Better battery life or the same with better performance when compared to Sandy Bridge ULV. The configurable TDP is certainly interesting and I wonder if Apple will make use of it. Looks pretty good and the gains are in line with what I expected. Whether I'll be persuaded to upgrade my 2011 13" ultimate is another matter.
http://www.anandtech.com/show/5843/asus-zenbook-prime-ux21a-review/1
http://www.anandtech.com/show/5843/asus-zenbook-prime-ux21a-review/1