Last August, 13 new explorer skins were introduced with the monthly reward system of the free trail. Since then every month one of these was the reward of the month. That means we will run out of new skins to unlock in September this year. In my opinion this would fit well with a late 2024 relase date.
By the way, the PUP in which the skins were datamined was the same the danish and polish flag were found. And the “russian” skin which was a polish woman was replaced with a bear in the final release. I guess we will see her again in the polish Civ.
We are also still missing some maps that stoped beeing added in updates after this PUP but are (mostly) shown on other loading screans.
Gibraltar (south of spain)
Balearic Islands (east of Spain)
Malta
Caspian sea
Black sea (noth of anatolia)
north sea (east of england)
iceland (west of scandinavia you can see the last letter D)
ural mountains
?one more next ot ural?
persia (not shown anywhere yet)
antarktika (not shown anywhere yet)
greenland (not shown anywhere yet)
Maybe they will come with the DLC.