A lengthy forum post by Blizzard's Jeff Kaplan outlines changes they plan for competitive mode for Overwatch based on the current testing of the mode on the PTR. Jeff discusses their growing understanding of how best to handle sudden death overtime and other changes they are planning based on feedback from testers. Some of these will come before the mode goes live (currently planned by the end of the month) and they also describe other changes that will take longer to implement. Here's the outlook on the balance between perfecting things and getting the new mode launched:

The extent of the updates we mentioned above are non-trivial. There is a lot of work that needs to be done to remove the coin flip and change the format again in Escort and Hybrid maps, which means that they’re not something we do can overnight. In fact, they’re not something we can realistically do until our Fall season. While we think they’re good changes to make, we don’t feel that holding back Competitive Play until the Fall is the right thing for the game right now. Instead, our goal is to release Competitive Play in our next content patch and kick-off our Summer season with the current ruleset.

There’s a few reasons for this: We want players to be able to work towards Competitive Play rewards sooner rather than later. We’ve also gotten a ton of positive feedback from people who are playing and enjoying the system right now on the PTR. And, perhaps most importantly, we feel like starting the Summer season will allow us to learn a lot about what works in Competitive Play and what doesn’t—even more than we have from the PTR. I’ve mentioned previously that I believe Competitive Play is the type of system that will require a few seasons before we reach the place where we want to be. We need to run the system through its paces, in the live game environment, so that we can see how the community as a whole uses and reacts to it. By getting the system out there sooner, we can start making meaningful improvements sooner too.

Speaking of improvements, while major changes to Competitive Play likely won’t be coming for a few months, we’re looking to get the Escort/Hybrid map changes and draw functionality on the PTR in the near future. Right now, if all goes well, we think we’ll be able to have those changes ready for testing sometime in late July.