first of all, the album that was planned after makaveli WAS one nation. say what you want about what album was recorded when, that's got nothing to do with shit. in the middle of 96, tupac wanted to put out a me against the world pt. 2. its pretty obvious that project got scrapped although it is very likely that several songs were recorded for it. maybe it was even one of the three finished albums tupac talked about. his plans changed, and by the time he was killed the idea was to set up makaveli records and drop one nation.
and i very much doubt there is a sequel to the makaveli album. if there were, you can trust money that it would be out by now instead of r u still down.