The iconic map Dust2 was taken off active duty a few months ago. The map was outdated and needed to be remodelled. The developers were quick on their task and ensured that the map was up to date with better graphics which befit the map.
It has now been released within the client and players can resort back to ensuring that they will be able to play on their favorite map yet again.
The quintessential CS:GO map, Dust II has been a classic since its original release. The map captures the essence of CS and in this new release we wanted to honor its pure form while buffing away the jagged edges.
Source : Counter Strike Blog