On version 2.78 there are new keyframe types available on the timeline.
Are they only colors that display on the dopesheet with no other funcionalty?
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They are only for visual distinguish regular keyframes from different animation events or states.Besides I would swear they were there earlier (just can't find them in 2.77). Although I found conversation on the topic from 2009 so it's definitely not a new feature. Check the manual for more info