Fans of Minecraft are a hardcore bunch, and they've already begun digging up information about the next patch for the Xbox 360 version of the game, which comes under Title Update 12 (TU12)—none of which has been revealed "officially" (at least not on the game's official blog) by either Notch or anyone else on the Minecraft development team at Mojang or 4j.
Instead, the fans have discerned potential changes and updates to the game based on screenshots released and remarks made by members of the dev team on Twitter.
The following details were compiled by miningmouse34 on the Minecraft fan forum:
Screenshot 1:
Upside Down Stairs
Iron Golems
Jungle Biomes(including planks and cocoa)
Tameable Ocelots
Redstone lamps
Screenshot 2:
Top Slabs
Corner Stairs