After Sigma announced the 24-105mm f/4 DG OS HSM lens, next rumored lenses from Sigma will 300mm f/2.8 OS and 400mm f/2.8 OS lenses. These new sports lenses will be announced sometime in 2014, according to Canonrumors.
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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