At PAX 2011 Minecraft 1.8 “The Adventure Update” has been shown by Notch, he gives a commentary through the video. It appears some of the key updates for Minecraft 1.8 are the new terrain as expected, some graphics changes and tweaks, the introduction of the Endermen / Enderman enemy who can teleport from what is seen, remember just do not look at them!
Also the NPC villages look interesting but empty. Notch also makes it clear that Mojang will be breaking this update down into two parts, Minecraft 1.8 and Minecraft 1.9, with the expected realease of Minecraft 1.8 in a few weeks. Dungeons do not seem to have been mentioned much, however they are expected to be updated in the next release.
A creative gameplay mode has also been officially added, allowing the player a totally creative experience similar to the original version of Minecraft that started the whole journey. Enjoy the IGN video below.