Watching that video, and that dungeon there, it is quite impressive. The workmanship put into that trap system shows how well the wire mechanics and the new functions have become. I was surprised to see a spawned mob (right after taking the emerald), though that could have been mere coincidence. The artwork of the new pillar creations, and even the wall designs are very well done.
Keep up the good work, excited to see what 1.3.1 will bring, and what 1.3.2 mainstream line will do for the community (give those summoners some more love, and the gunslingers).