According to the General Manager at Sigma Benelux, the Sigma SD1 will be released at the end of June, 2011. Sigma is currently running a SD1 giveaway that ends on May 31, 2011 - they better have the camera ready by then 🙂 Some other rumors suggested that the price and availability of the SD1 will be announced tomorrow (Friday).
See all Sigma SD1 related posts here.