nForce is a chipset developed by Nvidia for the AMD athlon/duron CPU's. There will be no "replacement" of VIA... it will simply co-exist w/ the via chipsets. nForce may also be implemented to an Intel CPU in the future, this is unknown as of yet though. In any case, do some searches on the forms and the web regarding this... I believe Anand has an article about it... looks promising and will fit nicely w/ existing chipsets for the athlon (ie. AMD760, KT133(A), SiS735, KT266, and the ALi MAGiK).
alin