"Optimizing app X of Y."
OTA download in Central Virginia (Richmond) worked fine at 8:30am EDT. Installing now.
Just rebooted. "Software update complete."
Had to re-plant a couple of shortcuts, as noted above. The update re-arranged the quick access buttons on the notification pull-down (presumably back to the default order; I had changed them around).
Just ran Real Racing 3 (GPU/CPU intensive game). Smooth as butter. But then, it always has been. Looked as great as ever.
Good luck!
EDIT: No problem with tapping sounds or haptic feedback or anything. Not with the screen in general, or with the default keyboard. But I use SwiftKey.