Valve has rolled out the Matchmaking Update for "Dota 2".
In happier news, Solo Queue is coming back. The first and foremost is to stop players from abusing from different accounts.
Valve is adding a feature that it is well poised to execute thanks to its direct integration into the Steam API: it will now register ranked accounts against phone numbers to combat abuse by various low ranked users purchasing and then using high ranked accounts to essentially play games that they are normally not skilled enough to be part of.
A blog post from Valve states that "players using multiple accounts" results in a "negative matchmaking experience at all skill brackets". Basically, Valve want to make this slightly awkward, making multiple accounts more hassle to set up, therefore reducing the number of people who can be bothered. This requires players to reach a certain rank in-game and register a unique phone number, at which point they'll be more likely to be matched with other Prime accounts.
Phone numbers can be unlinked from an account so that a new one can be swapped in, but there is a three-month waiting period before the original number can be tied to a new account.
Valve is also reviving Solo Queue, a feature that allows players to choose matching with other solo players only. If you're a casual Unranked player, you probably don't have much to think about except that intentional feeding will be punished more harshly and your solo MMR may impact your party MMR.
A balanced party matchmaking is also announced. "Effectively, these players will search for a match as if their MMR were halfway between the Solo and Party MMR values". Just because the team MMR is less doesn't mean they would allow newbies to compete against the particular team. This includes major change for the ranked matchmaking system which has caused quite a bit of debate. People who are often in low priority for their bad behavior should change their habits or be stuck in LP forever.
"Being marked for low-priority matches now results in a duration-based ban from the Ranked queue, in addition to the current game-count-based low priority requirement".