BHphoto says that the “item remains unavailable” (thx Roger). The lens, announced back on September 5, is still unavailable at the major US stores. There are some at top rated ebayUS reseller popflash here and pictureline. David just told me: “BTW, the current situation with the 23mm shows the wisdom of ordering the very first day you can. I did that (at 5 AM, as I recall!) from Adorama and have had the lens for quite a while, at least here in the U.S.”
[UPDATE: BHphoto expects to have the 23mm available on December 2]
The ephotozine review is online, check it out here. The PROS: Extremely sharp stopped down – Very good sharpness in the centre at maximum aperture – Lightweight – Useful hyperfocal scale – Excellent build / CONS: Not as sharp towards the edges of the frame at maximum aperture as you may expect.