Yesterday we talked about the [Dynamic Queue Updates](http://na.leagueoflegends.com/en/news/game-updates/features/dynamic-queue-and-future-league)
The same time we released the post we enabled a feature which attempts to get players their primary positions more frequently. So far the results are looking promising with players getting their primary position picks way more frequently.
We are also now enabling Autofill in NA to address high MMR match times. Described from the article above: "To address position shortages, we’re adding an autofill mode that can trigger when queue times are too long. If players enter queue with excessive estimated wait times, the matchmaker will potentially assign them a role other than the two they selected."
This feature also comes with better queue time estimates. If your queue time estimate is long, you'll be notified before you enter queue that you are in the autofill category and may not get your primary or secondary. If not, it'll work the way it does now where you'll only be able to get your primary / secondary.