J/K (or fn+Up/Down cursor arrows) nicely cycle thru annotation, but not until focus is given to annotations (at least that's how it seems). Also, the cycling feature is not obviously documented anywhere (I just searched possibilities and got "lucky").
COMPUTER: MacBook Pro
OS: OS X 10.9.5 (Mavericks)
BROWSERS: Chrome, Version 45.0.2454.85 (64-bit. Firefox, 40.0.3. Safari, Version 7.1.8 (95188.8.131.52.1)