This is a list of the new features
- Added new recipes for Smooth Sandstone and Chiseled Sandstone.
- Added new Mobs – Zombie Villagers.
- Added new terrain generation features – Desert Temples, Desert Villages, and Jungle Temples.
- Added Trading with villagers.
- Added Anvil interface.
- Added sideways log placement.
- Changed placement of half blocks and other blocks on half blocks.
- Changed placement of upside down stairs and slabs.
- Wooden Buttons and Wooden Pressure Plates can be activated with Arrows.
- Can dye leather armor.
- Can dye wolf collars.
- Can control riding a pig with a Carrot on a Stick.
- Added different villager professions.
- Villagers spawned from a spawn egg will have a random profession.
- Furnaces can use wooden tools as a fuel.
- Ice and Glass panes can be collected with silk touch enchanted tools.
- Nether mobs can spawn in the Overworld from Portals.
- Creepers and Spiders are aggressive towards the last player that hit them.
- Mobs in Creative mode become neutral again after a short period.
- Remove knockback when drowning.
- Doors being broken by zombies show damage.
- Ice melts in the Nether.
- Cauldrons fill up when out in the rain.
- Pistons take twice as long to update.
- Pig drops Saddle when killed (if has one).
- Sky color in The End changed.
- String can be placed (for Tripwires).
- Rain drips through leaves.
- Levers can be placed on the bottom of blocks.
- TNT does variable damage depending on difficulty setting.
- Book recipe changed.
- Boats break Lily Pads, instead of Lily Pads breaking Boats.
- Pigs drop more Porkchops.
- Slimes spawn less in Superflat worlds.
- Creeper damage variable based on difficulty setting, more knockback.
- Fixed Endermen not opening their jaws.
- Added new Host Options for flying, invisibility and invulnerability for remote players.
- Added teleporting of players (using the player menu in-game).
- Furnace will return an empty bucket when fueled by a bucket of lava.
- Updated Bonus Chest content with more items.
- Added new tutorials to the Tutorial World for new items and features.
- Updated the positions of the Music Disc Chests in the Tutorial World.
- Updated all texture packs and mash-up packs with new TU14 additions.
- Changed the gray wool texture for City Texture Pack to be more like a road surface.
The above lists were taken from
Please comment what to make a guide on, sorry i haven't been on for a long time i have been very busy... thanks.