Here's what they added, summarised by yours truly:

• Three new languages (Gallo, Uzbek, Vȯro)!
• Geysers can now be detected by skulk sensors, both at the beginning and end of eruption.
• Two new sulfur cube archetypes: Slow Bouncy (buoyant, but slow speed, high bounciness, medium friction and medium air drag) for stone blocks and Hot (same as bouncy but damages entities) for magma blocks.
• Sulfur springs (the overworld features) have been redesigned completely, probably due to all the negative player feedback about the original designs!
• Sulfur caves now no longer have tuff and granite strips in them, and they're less likely to generate below oceans, hills and mountains.
• New advancement: "Uh oh", achievable by having a sulfur cube absorb TNT.

I left out all of the technical changes, datapack updates and bugfixes for better readability, but they're included in the changelogs linked if you would like to read about them.

Here's the official Minecraft wiki article about the snapshot:

https://minecraft.wiki/w/Java_Edition_26.2_Snapshot_6

Hope this helps! I would really like this community to be a bit more active, so I'm going to post news like this regularly and try to contribute to a lively environment. :)

What do you think about the snapshot?

new sulfer springs good. I liked the granite strips just felt they overpowered the main blocks of the new biomes. The bigger generation and more pools is good but gray stone doesn't fit the vibe. I'd rather it be replaced by granite so the red look of the caves is preserved. Having tuff surround the biome rather than being as interspersed would be a nice touch to and also tie in with the new sulfer springs designs.

Even though I do not speak any of these languages, I believe it's good that they added them.

Language accessibility is more important than many English speakers believe, being unable to use software in a language you speak can be very limiting and frustrating.