Update: Sigma has posted some SD1 sample images on their website.
I was expecting to hear some updates on the Sigma SD1 during the CP+ show in Japan. The camera was initially scheduled to be released around February of 2011. I hope this will not turn into another almost 2 years delay like the SD15.
The Sigma SD will have a 46 MP(4,800×3,200×3 layers) 24×16mm APS-C X3 sensor and dual TRUE (Three-layer Responsive Ultimate Engine) II image processing engine. There were some rumors that Sigma is working on a full-frame version of that sensor. The SD1 will not have video, but they may consider it in future models.