Via the CS:GO blog:

SOUND

• Increased fidelity and weight of jump land sound.
• Landing sounds now play an additional sound depending on the surface.
• 3rd person footsteps are now slightly louder in relation to weapon sounds for increased positional clarity. (Further volume compression may be possible by enabling “sound normalization,” “volume equalization,” or a similar setting in your audio playback device properties)
• New surface footstep sounds to reduce repetition and phasing as well as increasing listenability and positional clarity.
  • Concrete
  • Wood
  • Rubber
  • Snow
  • Glass
  • Grass
  • Mud
  • Dirt
  • Solid Metal
  • Metal Grate
  • Metal Chainlink
• Fixed a bug where give_ammo sound was playing for every shotgun shell insertion animation.
• Minor volume mix adjustments
  • (Note: For players using virtual surround sound, please be sure to set the audio settings in CSGO to 5.1 speakers.)

MISC

• Awp now always un-zooms during reload animation
• Misc player animation CPU performance optimizations
• Overview icons can now be scaled with the convar mapoverview_icon_scale

STEAM CONTROLLER

• Game now requires Steam Client to be updated as of Oct 14 2015 or later.
• Added native support for the Steam Controller

DEDICATED SERVERS

• Added concommand sv_setsteamaccount to specify Game Server Login Token. To create a GSLT go to http://steamcommunity.com/dev/managegameservers

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Rumor has it:

• /u/aparatis is uploading videos showcasing the new footstep sounds on various areas of some maps

• If you use a custom font in CS:GO, it may have been reset to the default one

• /u/xPaw (one of the people that maintains SteamDB) shows off the DreamHack Cluj-Napoca trophies for participating teams

• There's also apparently a 2nd level attainable for 2015 Service Medals

• Here's the item schema update, which contains the trophies: https://github.com/SteamDatabase/SteamTracking/commit/99da08332c92edcc2a820667d1bd365586cf7feb

  • Not necessarily caused by this update (or this item schema update) specifically, but still worth mentioning: if you live in South Africa, Saudi Arabia, or the United Arab Emirates, Valve recently implemented localized pricing on the Steam storefront. CS:GO items purchased from the store will be charged in your local currency, which will also mean that what you deposit from a debit/credit card will be what you get as there will no longer be any US conversions applied from your card
  • If you're in any of the above countries and want to keep track of how things are priced, be sure to watch Dota 2's item schema, which will contain conversion data and provide a bit of a heads-up for impending changes

• Size is ~75 MB