Changes

Adjusted steam engine and turbine collision boxes so player can walk between two steam engines.
Roboports allow exporting both logistics and robot stats at the same time. more

Graphics

New or updated sound effects include:
Transport belts - new concept for these sounds.
Turrets rotation sounds and fold/unfold.
Weapons improved and made more powerful, e.g. submachine gun, shotgun, gun turret, vehicle machine gun, Laser and electric beam.
Particles: Water splashes, Tree debris.
Various mix level tweaks including the train, enemies.
Attenuations (audible distance) adjusted for entities such as Pipe, Substation and Offshore Pump.
New sound when walking over ore patches.
Default Sound Settings Updated:
Music, Game Effects and Walking sound lowered, Environment sounds and Master Level raised.
Zoom audible distance and volume levels adjusted.
Maximum Environment Sounds increased (edited).

Fixed mining entity with randomized mining result amount would never return the largest defined amount. more
Fixed crash when loading replay. more
Fixed reading LuaPlayer::entity_copy_source when the player is dead. more
Fixed that upgrading and delivering modules at the same time didn't work right. more
Fixed a crash when closing the game while some GUIs are shown. more
Fixed crash when setting max_group_gathering_time and min_group_gathering_time to the same value. more
Fixed discharge defense equipment had the wrong sprite in the equipment grid. more
Fixed that artillery wagons wouldn't show out of ammo icons. more
Fixed that modded cargo wagon colors wouldn't copy correctly through blueprints. more
Fixed furnaces with recipes using fluid ingredients could cause crash. more
Fixed a crash when removing a player that has modded associated character entities. more

Furnaces now ignore off_when_no_fluid_recipe property of their fluid box definition. Fluid boxes will not be disabled based on enabled recipes. more
Changed colored concrete tiles to be non-mineable.

Added LuaEquipmentPrototype::automatic.
Added "include_entities", "include_trains", "include_station_names", and "include_modules" fields to LuaItemStack::create_blueprint.
Added LuaRoboportControlBehaviour::read_logistics and read_robot_stats
Removed LuaRoboportControlBehaviour::mode_of_operations

Use the automatic updater if you can (check experimental updates in other settings) or download full installation at http://www.factorio.com/download/experimental.