Concerning the DLCs, the Expansion is releasing so early. And the next one will come out in early 2019 at the earliest. Unless it's coming out in 2018 also (unlikely). There's a space of 10+ months between that. How is Firaxis going to make money if they don't release any DLCs then?
I really want this game to have more Civs than Civ5, so I want more DLCs between the expansion or a third expansion in 2020.
I really hope you're right. I believe that popular civic DLCs may be more attractive marketing than expansion, while they may reserve some unknown names for an expansion. Perhaps the first expansion released so soon indicates that we will see some DLCs before the second expansion.
I really hope we see more civilizations and wonders than Civ5.