Eh. Didn't like Modern, and haven't seen anything in Future that appeals to me. And I love Grim Tales, so I can't see using anything but that for psuedo-historical or low magic.
Granted, I haven't paid much attention, but it seems to me that Modern hasn't gotten a lot of support. Not sure that Past would get a lot of attention, as it would be attracting a lot of the same writers and such as standard D&D.