I am very strongly doubting it. nVidia's first attempt at a mainstream PC chipset... given that it seems very unlikely they'd try dually with this one. Besides, the AMD K7 platform is extremely difficult to design a working SMP platform for. Why do you think AMD took so long to do it, even with the assistance of DEC Alpha engineers.
Beyond that, VIA has yet to even indicate they intend to even attempt to do so, even depsite the fact that we already know that the KX133/KT133/KT133A series of chipsets is theoretically already capable of SMP.
Micron also tried long and hard to implement it on their much hyped Mamba chipset, and that also ended in failure.
No, I'd so it's so unlikely for the nForce to ever see a dual processor AMD Athlon based solution that it borders on the ridiculous.