Notch recently revealed more information regarding the 1.8 Adventure Update. The following things have been confirmed for the update's release:

NPC Villages
Randomly generated dungeons
New biome code
Fully functioning Creative mode (with Creative-type access to server mods/admins)
Critical hits
Sprinting
More farming options
Brightness slider


He also mentioned that mod support was definitely being worked on, but that information on the update as a whole would be kept under a tight lid, to avoid revealing too many surprises.

We will continue to update the community as information becomes available

Looks sick man, can't wait thanks :y: