Again to be clear I'm totally happy w/ the removal of multi queue and this post is purely devil's advocate
The most likely thing that will happen now is that the same Premades that have existed for the past several weeks will continue to play together but will do so by counting down in Team Speak and solo queueing at the same time. They will do this purely because you simply cannot earn a high standing if you wait in long Premade VS Premade queues, and fight long tryhard games against enemy premades. It has nothing to do with skill or willingness to fight other premades. It is purely about honor per hour.
Anyway, it APPEARS that countdown queueing is already what Premaders are doing on both factions (for the record I have nothing against it personally). This method doesn't guarantee they get in the same game, but it means that for the most part the same players will continue stomping games together in the same groups.
Obviously these changes are a HUGE improvement because solo queue players have full/legitimate games once again, and premaders have to actually fight a full team in every game. The only point I'm trying to make is that premades are going to switch to countdown queueing, and then they will be thrown into the same queue pool as pugs.
So everything will play out almost exactly the same as if we had OLD queue system + no multi queue, with the only real difference being that premaders are forced to endure the headache of countdown queueing instead of simply queueing as a raid.
Again, I love the changes and could care less about premaders or their honor, this is just my 2 cents.