Sigma just announced five new (and upgraded) lenses at PMA:
8-16mm F4.5-5.6 DC HSM (New)
17-50mm F2.8 EX DC OS HSM (Added optical stabilization and 1mm wider)
50-500mm F4.5-6.3 DG OS HSM (Added optical stabilization)
70-200mm F2.8 EX DG OS HSM (Added optical stabilization)
85mm F1.4 EX DG HSM (New)
Prices don't seem to have been announced yet, but I may well be tempted by the 17-50mm F2.8 OS if it's sufficiently cheaper than Canon's 17-55mm F2.8 IS and is at least reasonably sharp.
8-16mm F4.5-5.6 DC HSM (New)
17-50mm F2.8 EX DC OS HSM (Added optical stabilization and 1mm wider)
50-500mm F4.5-6.3 DG OS HSM (Added optical stabilization)
70-200mm F2.8 EX DG OS HSM (Added optical stabilization)
85mm F1.4 EX DG HSM (New)
Prices don't seem to have been announced yet, but I may well be tempted by the 17-50mm F2.8 OS if it's sufficiently cheaper than Canon's 17-55mm F2.8 IS and is at least reasonably sharp.