Sigma is rumored to add new lenses to their prime and macro lenses line up in 2013. Sigma is planning to introduce new lenses for Full Frame sensor cameras. The new lenses in Art series rumored to be the 135mm f/1.8 DG and 24mm f/1.4 DG.
Sigma 18-35mm F1.8 DC HSM lens officially announced for APS-C sensor cameras. The Sigma 18-35mm F1.8 DC HSM is the world’s first lens offering an aperture of f1.8 throughout the zoom range.
So Accroding to CR, the Sigma 135mm f/1.8 DG OS HSM lens and Sigma 24mm f/1.4 DG lens are coming in 2013 and also there may be a update for 50mm f/1.4 lens coming in 2013 too.