My biggest beef with some of the ultra books is their Ram, why limit this to 4GB?
You may also want to consider the new Sony:
Sony VIAO SVP13215CDB, w/ Core i5-4200U, 8GB, 128GB SSD, 13.3in FHD Touch, Win 8 at Memory Express
It's an i5 but it does use the new Haswel chip (although it's build able on Sony site). I was considering this one myself but didn't like the viewing angle of the screen.