Download link! - www.mojang.com/

The Changes added this week! :

Added an "Open to LAN" menu in the in-game menu, which allows players to open their world to other players. In the menu, the player can choose to turn cheats on or off, and choose the game mode.
The multiplayer menu now scans for LAN servers (singleplayer worlds which are on the same LAN and have been published with the /publish command).
Games can now be started in Adventure Mode
Villagers will remove a trade option after it has been used 3-15 times.
Added wooden stairs for the remaining three wood types (spruce, birch and jungle).
Redstone and Rails can now be placed on slabs and stairs positioned upside down.
Removed the downwards knockback while drowning
o A lot of smaller changes and fixeso .
The /tp command now allows teleporting to specified coordinates.
The syntax for this is /tp [target player] .
The other functionality of the /tp command is still there