While at least one in this list appears to be a re-announcement, Sigma has today announced four lenses:
Sigma 12-24mm f/4.5-5.6 II DG HSM Lens
Sigma APO 50-150mm f/2.8 EX DC OS HSM Lens
Sigma APO 120-300mm f/2.8 EX DG OS HSM Lens
Sigma 105m f/2.8 EX DG OS HSM Macro Lens