React add-ons

• TransitionGroup and CSSTransitionGroup
• LinkedStateMixin
• cloneWithProps(deprecated)
• createFragment
• update
• PureRenderMixin
• classSet(deprecated)
• TestUtils
• Perf

Упрощаем API

• LinkedStateMixin
• cloneWithProps(deprecated ->  React.cloneElement)
• createFragment
• classSet(deprecated -> JedWatson/classnames)

Анимации

• CSSTransitionGroup
• TransitionGroup 

Immutable data

• update
• PureRenderMixin

Dev utils

• TestUtils
• Perf