As impressive as the functionality sounds, this is actually one of the easier updates. "We're implementing the features from the Beta 1.7.3 version at the moment, and it's nowhere near as tricky as the 1.8.2 changes will be," Burns told OXM. "There are no big architecture changes with the move to 1.7.3, so it's been quite straightforward. The move to 1.8.2 is much more challenging."
Dubbed the "Adventure update", Minecraft 1.8 isn't so much an expansion as an entirely new game. It adds Creative Mode, which gives players invulnerability, infinite blocks and the power of flight, plus a host of mechanics that are designed to make Survival Mode feel more like a classic dungeon-crawler.

You'll have a new stamina gauge to reckon with, replenished by eating things, plus new enemies like the Endermen, the ability to parry attacks, optional NPC villages and vast underground strongholds, stocked with rare items and materials. On the technical side, expect a revamped lighting system. Read the full list of content over on the Minecraft wiki.

"This is going to be the most difficult update due to the sheer amount of changes, and also the underlying architecture changes that come with it. We're looking forward to the challenge!" Burns reflected.

Release
Please post to keep topic alive.