According to a post from June there have some been some rumours around that there is no future - on the other hand there has been reportings that there is no sign for such change.
Probably you gain some more insights from this one - at the moment there is no official announcement to my knowledge but no significant progress either (as for new versions).
If Atlassian will abandon SourceTree I hope they release the source for the community to continue developing. It's a great app and it enables users to have more fun with Git. I personally choose SourceTree every day over the other Git tools available. Let's cross our fingers there will be good news..
Supported Platforms macOS Windows We recently introduced support for additional hosting services such as GitHub Enterprise, GitLab (Cloud, Community Edition, Enterprise Edition), and...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events