The quality was poor even if you could get it to work; signing into Bitbucket (also by Atlassian) repeatedly crashed the app for me, which wouldn't have been a problem if it didn't automatically attempt to (and then hang) every time I opened it.
Re:New SourceTree is here
by rajksarkar on Wednesday February 24, 2016 @09:22AM
(#11166880)
Hey David - it was a mistake on our side. Said that we're planning a new beta release process for our upcoming SourceTree releases and we’ll share more in a blog post in the coming days.
It wasn't a beta version, it was a main release and the quality was too poor for them to admit it. This is just sleazy PR.