Definitely good news! I was able to watch the WWDC 14 keynote today with closed captions, so I learned about the new features. Among the features that I am looking forward to are Continuity and Handoff. Both of these new features work in tandem with iOS devices to allow you to seamlessly pick up and continue your work as you switch from device to device.
OS X Yosemite and iOS 8, can't wait! These are indeed an exciting times