The first ladder season is coming to an end and we already have some new features on the horizon. While we don't know exactly what is planned, we do know that Blizzard is planning a PTR soon. A PTR usually means that a significant update is coming, which was recently confirmed by PezRadar on the Blizzard forums.
the team is working on a feature that they would like to test in PTR that is pretty big
We are expecting an update next week, but people are already speculating on what it could be, like Stackable Runes and Gems.