New evidence of two unrevealed leaders in the game:
First, if you hop over to the IP peoples thread, they are featuring civs with white-on-black and white-on-green colors. White-on-black are Magyars, Slavs, Funan, which are probably expansionist (or undifferentiated?), and white-on-green are probably diplomatic. We can see red (militaristic), yellow (economic), and blue (economic) here (magenta (cultural) is missing). I am basing this largely off the colors of the garbs to identify the "civ;" if you look at the actual models, the leaders seem paired with backgrounds that may not match (red lady is a diplomat, econ guy is a scientist, blue guy is a warrior, etc.). Which may mean just some nice visual nods to particular leaders of those civs, but I am absolutely banking that color = city-state type as it has been in the past.
It also looks to me like maybe IPs gain "dimension" over the course of the game. Look how the exploration units are two-colors. Red becomes red and yellow, which follows through to the end. Blue becomes blue and yellow, which features in the helmets and shoes. Red again becomes red and yellow, and we can see a little red in the guy's tie. What also seems to be the case, if we are to believe these are all the same IP, is that the models dictate
what kind of IP they are, whereas the colors seem to indicate
what sort of relationship you have with them. Not totally sure on this yet, though.
But I noticed some units have TWO colors, not just white and X.
In particular, red-on-blue. To me, this strongly suggests a Norwegian leader reveal (since colors are tied to leaders and that was Norway's colors in VI). Cnut seems more likely now, maybe even as the next leader reveal.
If you look at the first image, the three-unit set on the right looks like it could be Spain? Yellow on red matches, we could expect a "Mediterranean" antiquity unit, and that exploration unit looks very buccaneerish.
Looking at the second image of nine regional styles, most of them are red-white, other than the two I pointed out. The one I'm not sure of is "North American," which doesn't have white in his shield but in his shirt. I'm inclined to dismiss this as just another IP unit for now.
But guys, I think this soft-confirms two new leaders (maybe Norse and Spanish, maybe Norman), at some point. EDIT:
@Alexander's Hetaroi has also observed this could be William the Conqueror. Just substitute all my uses of "Norse" and "Spain" with "that leader with those colors."
REVISION: After looking at all of the X reveals, I do not think that is a yellow-on-red leader. If you watch the Khmer and Confucius videos, it looks like there is a "default" color scheme for buildings/units; no color-combo giveaways. I think the Roman, Middle East, Asian, and North American designs in the region lineup, as well as the non-blue-red units in the "units through the ages" are just the default palettes. But that blue-red is indistinguishable.