Everybody lamenting the 'Loss" of Pangaea note that, as stated, it is possible that almost Every Type of map now available except Terra and types like Seven Seas that require land at the edge of the map could be applied individually to each 'half' of the Civ VII map. That actually gives us an enormous variety of map configurations in addition to the size of map that changes with the Exploration Age.
Add in terrain like Tundra/Ice that is essentially Impassable until late Exploration or even Modern Age and limitations (I wouldn't go so far as to Prohibit) on terrain earlier - for example, it might be near-impossible to move an Army Commander and units - an 'Army' - across a desert earlier (look at what happened to a very competent Army Commander, Alexander of Macedon, and his army in the Gedrosian Desert coming back from India as an example). Other potential 'Terrain Blocks' might be in Jungle/Rain Forest terrain, which was notoriously deadly to unacclimated people. Mountains should not necessarily be impassable by themselves, but any peaks with snow on them, or covered with jungles (as late as WWII, the Owen Stanley Mountains in New Guinea slaughtered thousands of troops through disease and injury) could be very, very difficult to move through and impossible to stop in for any length of time.
Based on our experience with Civ VI and previous gams, it is easy to try to understand new mechanics in the game based on how Old Mechanics worked. That is a recipe for confusion, since we have been told that the Designers of this game tried very specifically to have a basic structure (Civ Switching by Ages, Built-In and Unavoidable Negative Events called Crises) very different from anything we've seen in the series before.
In support of the differences, I suggest that the configurations of maps will have to be not only very different, as has been noted, but also that they do not necessarily have to be more limited.
