Sigma 300mm & 400mm f/2.8 OS and 500mm & 600mm f/4 OS Prime lenses to be announced in 2014

The Sigma 200-500mm f/2.8
The Sigma 200-500mm f/2.8

Sigma is rumored to release some super telephoto prime lenses in the 2014. According to CR, Sigma is working on big prime lenses as below:
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