Well, Okinawa excluded, Japan is really stuffed enough that it deserves its own smaller gazetteer at this point.
Also, Star Wars Coreline is off..sorta.
By that, I mean the idea of whole sourcebooks on it is off. Instead, I'll incorporate the information where it's valid on Earth (for instance, Gungans and Jawas will be in the rewrite of the North America gazetteer, and Togruta will be in the Africa gazetteer unless there's an objection of them being there).
I plan on having a "Star Wars Modern" with a generic non-setting rules for any Star Wars play, canon or fanfiction, as a longer term (by that, I mean within the next year or so) goals to help lessen the dent of d20 Modern and the Star Wars Roleplaying Game alike having all too short official lifespans.
So, what is the next gazetteer, in that case? Well, since North America's rewrite is neeeearly done, I plan on having it be a general overview of the Sol system. Some ideas to bounce of of y'all as far as yay or nay goes:
Mercury: Due to its frequent old pop culture depiction as a planet with a "locked 'solar tide'", Mercury is a planet that has a permanent 'night side' and 'day side'. As a result, it has a large colony of Twi'leks (due to its similarity to the planet Ryloth, which has a similar makeup as a 'solar tide' desert planet), as well as a healthy dotting of spice and ore mines.
Venus: Most of venus is a Victorian ideal of the planet, with thick swamps inhabited by dinosaurs and lizardfolk. Thanks to Cowboy Bebop, however, there is also a somewhat arid western continent with a permanent human habitation.
Earth's Moon: Orbital colonies from Planetes, bat-like humanoids and bison-like creatures in crater jungles encased in strange oxygen bubbles from old world Real hoaxes, and H.G. Wells's Selenites living below the surface are just some of the oddities of our mother planet's lunar child.
Mars: Embroiled in a war between War of the Worlds-verse and Barsoom-verse Martians. No word on where the Ice Warriors are during this debacle, but one can be fairly certain they are plotting something.
Jupiter: Rather less violent than the planet we know, the gas giant Jupiter is home to many floating colonies, including a Rebellion-era Alternate of Cloud City. Its moon, Europa, is well known for the strange sea life beneath its icy crust.
Saturn: Its floating cities are home to the DC Comics-verse Martians, who were forced to emigrate from their war-torn homeworld.
Uranus: The base of operations for the Marvel-verse's Kree Empire.
Neptune: The frozen wastes of Neptune are currently cordoned off between the lands of the star yuki-onna from Urusei Yatsura and the iron realms of Futurama's Robot Santa.
Pluto: Due to several unpleasant events never referred to in polite conversations between Reals and Fictions, Pluto is a tectonically fractured world ruled by the mi-go.
Alternate Earths: Possibly the Planet of the Apes-verse Earth, and most definitely Primalis, the Harryhausen world. Others are in different solar systems.
As an aside, any references for Africa and Australia's future gazetteers would be nice as well, Marco, since the Sol one will probably be considerably shorter than your bog standard gazetteer.