Federico Viticci at Macstories:
iOS 8.1 brings bug fixes, speed improvements, and interface changes, but it also enables Continuity features such as Text Message Forwarding and Instant Hotspot, allowing iOS devices to better integrate with each other and Macs running OS X Yosemite.
Installed it this morning over the air. I had to run the ‘Welcome’ intro screens again, but so far, so good.