Smaller diamond blobs, but slightly more frequent. Less diamond ore overall though
Less iron, and it generates lower down
Reduced air exposure for coal
Ore distribution in Minecraft Snapshot 21w10a. Click here for a link to the full resolution image.
TECHNICAL CHANGES IN 21W10A
The maximum size that slimes can be summoned with is now 128
The give command can only give up to 100 stacks of items at a time (e.g. 6400 stone or 100 iron swords)
OPENGL
Rendering is now using OpenGL 3.2 core profile. All fixed function rendering has been replaced with shader based rendering.
SHADERS
Shaders are now included for all supported render states. Any shader except for the blit shader can also be replaced in resource packs. For now replacing these shaders is not officially supported and the way it works may change in the future.