Asus says the "full HD" model should be available "immediately" for $699. That variant features a 1080p matte-coated IPS display, a Core M 5Y10 processor, 8GB of RAM, 256GB of Serial ATA storage, and a battery rated for 10 hours of run time. Asus quotes a weight of 2.6 lbs and a thickness of 0.48", which is pretty frickin' thin.
More exciting is the "QHD+" version of the ZenBook UX305, which comes equipped with a 3200x1800 multi-touch IPS display. Sadly, we'll have to keep waiting for that one. Asus says it'll be available in the U.S. "at a later date." No pricing is quoted, but since the rest of the system's specs are supposed to be identical to those of the "full HD" variant, the attached price premium may not be too outrageous.