Valve had promised us a new matchmaking system ‘soon’. They have already implemented a toxicity factor into CSGO and many hope that they would be implementing something similar in Dota2 too. The quality of matches and the way matches are made up of better players is extremely important for players to have a good time.
The first season of our new matchmaking system will begin on November 22nd.
— DOTA 2 (@DOTA2) November 16, 2017
With significant amount of time having passed since the initial announcement, Valve have revealed the exact date for the release of the new matchmaking system.