They like to keep us guessing
. They at least could give out September with the first patch.
Last option I checked is to see if the additonal content provides some hint, considering that, is in Colombia-Maya DLC it could have some relationship with the provided civ's covered area.
September pack has additional natural wonders and an additional map. That reduces the likeness of it being Europe, IMHO, because of less area covered, and a map already existing.
Middle east has certain potential (craddle of civ map and maybe a game mode related to that), altough I don't know if we have that much well-known natural wonders there (unless they go mithycal again) that cannot overlap with Sahar el beyda, the Dead Sea, Gobustan, Pammukale or even Zhangye Danxia. SoonTM might then refer to start of civilization, or to continuously expected civs (byzantium, babylon/assiria).
The option someone posed it can be a
exploration pack, combining Portugal + one African Civ (scramble for africa scenario), or one NA Civ (to complete a new world scenario) could fit more. It is easier to spread natural wonders with such a high scope map (you could spread them, taking a iberian/european one, plus some others from the destination area -which makes Africa more likely, as the Americas are already covered for extra Natural Wonders with Maya+GC pack-. But then, that will take the "moors" out of November, as Iberia is already covered here, and I doubt we get another sub-saharian in NFP. "SoonTM" could refer to the time the explorers took to reach new destinations. The new game mode could involve a more interesting way to deal with overseas colonies, trying to cover the gameplay gap that leaves England/Spain as "meh" civs.
November Pack has additional city states and great people.
I'd say
middle east has also great potential here, with many options for city states, and maybe a look for non-european-centered great people (altough I think the game has done a good work of providing variety already). MoorTyres could refer indirectly to "More Tyres - more early important cities which did not build its own civilization... altough Tyre has)
Extra city states and great people also is a good fit to
Italy, and MoorTires then a clear reference to race-car production, so we can have an Industrial Nord-Italy focus for the civ to separate it from Rome. Tires is also a city in italy. Moors were also on sardinia for some time, just to complete the reference.
We know already
Asia is January pack, so altough it might be interesting to reinforce great people and CS there, I think is less likely (some might be included nevertheless)
But well, that is just wild guessing fun.