I have to support the rearranging of UI. I personally don't think Elemental is a game where "minimal UI' is in any way a positive feature. The ability to hide UI to look at the sexy shader engine you're pooring time into... yes. But the UI right now seems minimalistic in a way I'd expect an action game to be. Less is better, sure, but when you try to compact info into a bunch of tabs at the bottom is when you know you have a problem because that isn't less info, just less space.
In terms of the combat screen. I have mixed feelings. The "irrelevant" information is very important, or else how would you judge your chance of winning. In theory, you could put up a percentage that does all the calculations for you, but some players still like to see all the numbers that are factored into it. (see "Fire Emblem" as they actually have 2 options for a screen very much like the one you're presenting here. 1 has 4 factors... HP, chance to hit, amount of damage, and chance of critical. The other has like 8, which are the stats used to calculate the 1st 4 include speed, weapon weight, skill, luck, and other things like that. Also, having all the stats presented when the battle is going to be on a tactical map, rather than auto-resolve, is about the only way I can imagine you'd do it. (I agree "level" doesn't really matter)
In terms of Caravan tech, I'd say that the moment roads exist, people will begin to travel them with goods. So once you have roads, I'd think they would have a economic function. The main thing that sticks out to me is "would they travel it with a cart or wagon? and would it be a sack carried on somebodies back, or a very large wagon hauled by several beasts of burden" I vote they are not unlocked apart from roads, though perhaps they have a tech of their own to advance specifically the ability to move goods, vs. the ability to build more efficient roads.
There was talk somewhere (I believe in a dev journal) that got me hooked on the idea of the developers not telling the player how to play their game. So I was inadvertently sold on the idea of super easy to customize UI with the ability to drag windows to where you want them to appear. So you don't always have the pop-up dialogue on the right side if you don't want it. Maybe you want it along the top, or in the upper left? Maybe you want the text formatted to fit in a square next to a picture, or maybe you want it to run from left to right across the entire top of the screen. maybe you just want it on a second screen
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For better or for worse... you, Frogboy, persuaded me long ago that this game UI should be focused on ease of customization. I'd say thats best done with plenty of "advanced interface options" and game windows or screens that can be resized and dragged around the screen, to reappear in the last place I decided to put it, and to be possibly parts of different tabbed info screens that I pieced together. It would be a lot of work, but that is where I as an eager fan of the game based almost entirely on dev journals, would expect/want the UI to be. (I remember there being discussion on "strategic zoom" in the discussion where I was convinced the UI should be as user option oriented as possible)
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I feel I made my views on the sovereign death pretty clear in the thread relating to that so there isn't much more for me to say on the matter at this point. However, I would like to jump up and down like a raving fan-boy that the sovereign should totally have his own creation screen. I don't know how this could not be a feature, considering how "core" he apparently is to the game. I'm not about to suggest Sims style customization (well... actually I am. That would be awesome! Shaping different facial features! with many many outfits to pick, and color schemes. It would be grand!) but at least better than MoM's wizard creation screen. You had 14 faces and a custom, which required you to pick one of the 14 faces. I'm not sure if anybody ever didn't pick custom except to say they have picked something other than custom. I'd want a little more customization than 14, mostly generic (or in contrast too over the top) faces. They were fantastic for being ethnically diverse I think, but that isn't enough for me to really value more than like 4-5 of them.