MQTT5.0 [1]_ [2]_
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The major functional objectives are::

  Enhancements for scalability and large scale systems in respect to setups with 1000s and millions of devices.
  Improved error reporting (Reason Code & Reason String)
  Formalize common patterns including capability discovery and request response
  Extensibility mechanisms including user properties, payload format and content type
  Performance improvements and improved support for small clients





.. [1] http://www.mqttfx.org/
.. [2] http://docs.oasis-open.org/mqtt/mqtt/v5.0/mqtt-v5.0.html