Dragon Age PC players: If you want a baseline of PC specs for Inquisition, I think it’s best to look at the newly released Battlefield 4 system requirements.
Both games are running on the Frostbite 3 engine. Considering the explosions and firepower in both games, this list is probably the most accurate guideline to follow.
(Edit: This is just a guess. Bioware hasn’t released any info on computer specs…but let’s face it: the next-generation is upon us)