There's a humble Bundle with all of the current Shadowrun sixth edition books. I'm reading the core and I'm a little surprised that I'm twenty pages in and they haven't mentioned the main metahuman races.
I am happy to see that it goes over what is going on at least at a high level on the major continents if the Earth. It was a real oversight of previous editions to not mention anything outside of a few continents.
We come here in search of a place to express our thoughts outside of the direct control and surveillance of unaccountable, mega-corporations. There is no common theme that binds us other than these being the bonds we've chosen rather than those that have been chosen for us.