Any recent AF third-party lens should work well with the D100. The D100 will not meter with any manual-focus lens, Nikon or not (with the exception of the fairly rare 500mm f/4P lens).
While I can't speak for Nikon, I dont expect them to ever offer and upgrade or modification that would enable metering with MF lenses. The reasoning behind this has been discussed at length ever since Nikon started making bodies like this. Nikon, of course, never really reveals why they do anything.