Xcode 9 beta has several new features for you to try out. One of my favorites is app testing over wifi! Read this list from Apple to get up to speed.
What's New in Xcode 9 from Apple
Daniel Jalkut breaks down the new Github/Xcode integration and talks about what's the next step to make it even more seamless.
Hint: It involves code signing. Sorry to ruin your day by mentioning those words. ;)
Xcode GitHub Integration by Daniel Jalkut