Like you can see, all these webs also thought the same that most of us:
I still think we will not see MT6 until they monetize MT5. Unless
MT5 just changed its name to MT6 to create the illusion of a new
product and attract those who hate MT5 without objective motives.
It is certainly going to be interesting to watch how this plays out. How long will a company want to run concurrent products targeting the same market? How will obligations to customers of the old platform be met if it is to become obsolete? Is MT4 going to insidiously merge into MT5 over time?
I'm sure there isn't this much drama when NT changes