The new Trust Factor matchmaking has the primary purpose to match together players that respect the rules and are positive members of the Steam community.
The reworked Dust 2 has definitely replaced the old one in the live client. Valve will keep updating the map according to feedback and bug reports received.
Dust 2 first changes - Pre-release update 10/12/17
Jess Cliffe, the co-creator of Counter-Strike, announced some adjustments on the new Dust 2 map. All the bugs reported in the past days have been fixed as soon as possible.
New Dust II in Beta - Pre-release update 10/10/2017
Dust2 was removed from active duty in February, and replaced by Inferno. Valve completed the rework, and now it is available for download in the beta branch.
A new update for CS:GO has been released. Previously, we talked about the molotov-smoke bug that was still affecting the game, hopefully this patch will improve the situation.