HOT UPDATE: One single 12mm lens is in Stock now at Amazon (Click here). I bet it will be sold out within minutes!
And here is the next hot review of the (let me say) wonderful Olympus lens! You can read the full and very detailed test at SLRgear (Click here). There are almost only good news! First the sharpness test proves that the lens is already sharp wide open. Chromatic Aberration is only slightly present and only in the corner when shooting wide open. Also Vignetting is a non issue. The distortion is very low and harmonic (easy to correct in Postproduction). Conclusion: “There isn’t much to add here that the tests don’t already say for themselves – the Olympus 12mm ƒ/2 M.Zuiko offers excellent results for sharpness in a quality package. The price might be prohibitive for some, but if you can afford it, you won’t be disappointed.”
No doubt, that lens is a winner! The lens should be in Stock very soon (late July) and you can already preorder it (UPDATE: I fixed the link. Sorry for the mistake. Now all links should work fine!):
In US at Amazon (Click here), Adorama (Click here), B&H (Click here), J&R (Click here), eBay (Click here)
in Europe at Amazon Deutschland (Click here) and eBay (international resellers).
in Asia at Digitalrev (Click here) and Amazon Japan (Click here).