The new ore is cool (its also red), the gem has an amazing texture, I don't see a problem in here anywhere, except the rarity. It's just ridiculous. Emeralds should be as rare as lapis, and should be green instead of red.
I don't like pyramids, there are too many desert structures now, and I hate, let me rephrase that. HATE the new sandstone villages. But other than that, it's pretty good. A few tweaks to emerald ore (the colour, the rarity) and it will be great.
The Sandstone looks good, but there should also be either some wood or stone bricks. There should be gravel paths, and they shouldn't collide with villages in different biomes. Then they will be good.
Yeah, Nether Warts should have a rare chance of spawning on soul sand, about the same chance as pumpkins spawning on grass. And Blazes, they should have the same spawn rate as Magma Cubes. There should also be Magma Cube spawners in fortresses.
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