The Talenta Plains are interesting. There's actually not a lot in the setting book said about them, so there's relatively little to remix correspondingly. The biggest change I have with it is both fundamental and yet will have little impact on what is presented in the book, though: I think the idea of plains indians (yet strangely peaceful) halflings riding dinosaurs is silly. It's like they tried too hard to make halflings cool, but all it does is beg the question of why make them be halflings at all, then?
Don't worry; I know the answer to that—they have to be halflings because halflings are in D&D is a core race, and Eberron is a D&D setting. I don't have them in Dark Fantasy X, so I'm swapping the halflings for jann, and getting rid of the very strange peace-loving vibe of them. (The Plains Indians were not peaceful, even to each other. The Apacheria spread over other indians who were in place prior to the spread of the Apaches, who are linguistically and genetically close to peoples from Alaska and western Canada. The Comancheria spread over much of the same area, displacing the Apaches as well as numerous other peoples from a spreading point in Wyoming. There are all kinds of records, even though records were scarcely kept, of Indians forcibly displacing, conquering and even genociding each other, both from parahistorical records as recorded by Americans or Spaniards as reported to them by Indians, or in the oral traditions of the Indian tribes themselves.)
Anyway, that's neither here nor there; my jann are obviously going to be a bit more aggressive, and will be as much Huns, Mongols or Scythians as they will be Plains Indians. A few other minor changes; the Holy Uldra will be a man, of course. I don't use the stupid Eberron dinosaur names, and I'm not 100% certain what kinds of dinosaurs there are on the plains. I think some kind of larger raptor-like dinosaur and terror birds making up the majority of the mounts, and various sizes of ceratopsians making up much of their beasts of burden, source of feathery hides, eggs, meat, etc. There's a brief mention of some kind bond between dinosaurs and halflings, but dinosaurs are very stupid animals; the very smartest of them is about as smart as the very dumbest of birds, or a crocodile. In spite of what Jurassic Park told you, I know. They don't have any real bond with people, especially not one that carries on from generation to generation; they are conditioned as mounts due to an awful lot of brute force.
Also; Krezent; there's no such thing as benevolent lizardmen, or coatls. I don't yet know what is in Krezent, but I probably won't decide what it is until I need to, which most likely won't come up. There's layers upon layers of ancient empires having left potential ruins across the landscape, although the coatl are unique in being somewhat benevolent compared to the others. I doubt I have much use for the ruins of a benevolent empire of weird snakey angel-beings.
Talenta Plains population remixed:
Jann: 75%
Human: 15%
Changeling: 4%
Seraphim: 4%
Other: 2%