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Here is your first good look at the changes that have been made to Dust 2 for Counter-Strike: Global Offensive. I'm sure this is probably the first of many, many, many, many, many, many, many times you will see the updated Dust 2. See, because the joke is Dust 2 is played a lot.

Valve put up a rather lovely guide that both shows and explains the changes they made to several key areas of Dust 2. For example, here is just a bit on the overall art improvement that they made.
ART
While Dust II’s gameplay doesn’t seem to age, the art needed a good sandblasting. The Bombsite B section of the map is now a historic Kasbah under restoration while Bombsite A is a bazaar and hotel. The texture resolution has been quadrupled and a North African prop set established for all you community mappers to use. Now, the bad news is the 2 pizza parlors are no more. The good news: they’ve been replaced by 2 dentist offices. Coincidence? Probably not.

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Old | New

There are also updated versions of the classic models. Look at 1337 Krew! Look at how stylish he still is!

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The best part is that you can play the new Dust 2 right now. All you need to do is opt-in to the current CS:GO beta branch. Following the steps in the link, the beta that you're looking for in the "Betas" tab is "1.36.0.7-rc1."

Valve says that they want your feedback on Dust 2, so be sure to give it to them. I'm assuming this means posting at places like the Global Offensive sub-Reddit or even Valve's own community forum section for the game. The full list of changes for this beta branch update are found below.

Changelog for CS:GO beta (1.36.0.7-rc1) for October 10, 2017
GAMEPLAY
• Updated version of de_dust2 added.
• Improved de_nuke bot navigation.

AUDIO
• Unique jump landing sounds for all major surfaces.
• Unique sounds for picking up weapons, grenades and ammo.
• Unique bullet impact sounds for vehicles and barrels.
• re-balanced music kit volume to be more in-line with the overall game volume.
• Improved resolution and quality of HRTF algorithm.

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