Sigma announced two revised lenses: the 50-150mm f/2.8 with OS HSM for crop sensor (DX) cameras (adds optical stabilization and weather resistent design, no price or availability yet), and the 12-24mm f/4.5-5.6 revision with HSM and weather resistent design (US$1400 MSRP).
Two previously announced lenses, the 120-300mm f/2.8 OS HSM and 150mm f/2.8 Macro OS HSM now have release dates and MSRPs: US$4700 and late February for the former, US$1600 and late March for the latter. (Remember, these are suggested retail prices, not street prices.)
Finally, another new lens is planned: the 105mm f/2.8 Macro OS HSM. No price or availability was announced.