Swift 5 was released as part of Apple's update of iOS and macOS yesterday (3/25/19) and I had literally just finished submitting an update to Fedora's Bodhi system for the previous development snapshot. I admit I was worried that there'd be some 11:59:59 change to Swift that wouldn't make it compile properly under Fedora, but nope, it built and tested perfectly first time! Kicked off the builds on the Fedora system for Rawhide, F30 and F29, went to bed, and in the morning did a fedpkg update that put them on the track to be publicly available. The link for the current version of Fedora (29 as of right now) is here and the next version (31) is here. As I recall there is a week or so where folks are invited to test and give feedback, and after that they can be pushed to be available to all. Whee.