The tier-based mode is already live for players on PC to test out, with Blizzard stating those on console will have to wait.
“We know this isn’t an ideal way to deliver new content, so we’re going to continue to refine our patching processes over the next few months in an effort to sync up our release dates across platforms as closely possible,” a community manager wrote on Battle.net. “Although our Battle.net client will always allow us to be more agile on PC, we hope to reach a point where we can release major updates on PC, Xbox One, and PlayStation 4 simultaneously.”
Players on PS4 and Xbox One are expected to receive the update in the coming weeks.
When Competitive Play launches completely, its first season will be shorter than previously stated; with the debut season running just two months instead of the proposed three. According to the official post, this is due to the late start date. The current season will run until August 18.