Announced at Photokina 2012 in September last year, the lens starting getting out to people in January and especially February of this year. Coming in at $1,250 USD - is it worth it? Check out this extensive and in-depth review of the lens.
Long and short of it; it's really quite good and represents an exceptional value.
Voigtländer 21mm f/1.8 Ultron Review
(This review is now fully accessible by the public - members got to preview first it over the weekend)