So at this point with the various KS news posts, the presentation videos and the PnP documents, we pretty much have all we need to test all the Empires (except sea but it should come up soon). The one thing that's still missing for me is the starting positions of the Empires Box factions.
-Moon: A shrine on the Moon I assume ?
-Sea: A shrine in a sea region ? Or maybe any sea region ?
-Earth: A shrine in an earth region ? Any unoccupied earth region ?
-Invisible God: Based on the lore I would assume its a Tower on Brithos ?
I'd expect Earth to start in two places at once, one in Pamaltela and one in Genertela.