I might've lost track of the discussion on it but I think I figured out some Polynesian stuff. Now that we have good pictures of Khmer cities, I compared the Polynesian scene and found that the generic architecture is clearly from the exploration era, matching the picture with the non-Byz southeast Asian mystery palace. As the Polynesia scene includes the units with mahiole hats, this would mean no modern era Hawaii - but also no ancient era "Polynesia" blob.
We also see what might be a City Hall or unique building, as well as a potential wonder:
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An interesting side effect: This allows establishing 12 civs for the exploration era without relying on wonders:
Abbasid, Bulgaria, Chola, Hawaii, Inca, Indonesia, Ming, Mongolia, Normandy, Shawnee, Songhai, Spain.
There might be some variations possible, like Bulgars being someone else from the area. But I think the number is fairly safe. Which gives hope that the 11 pips shown on stream were due to some civs being removed from the build either to mislead us or because they were too unfinished to be included in a playable build. A bit of caution remains, of course, as it could still be 11 civs with the Shawnee separated into a DLC already. Hopefully we see them selecting the Shawnee from a Mississippians start tomorrow on stream and then we'll have clarity.