Sigma Japan announced that they are going to ship the 19mm and 30mm f/2.8 lenses this month.
Here are some preorder links:
Black Sigma 19mm f/2.8 lens at Bhphoto (Click here).
Silver Sigma 19mm f/2.8 lens at Bhphoto (Click here).
Black Sigma 30mm f/2.8 lens at Bhphoto (Click here).
Silver Sigma 30mm f/2.8 lens at Bhphoto (Click here).