Sadly, Deus Ex: Mankind Divided, in spite of being great, was ultimately a commercial failure. Sales fell far short of sales for 2011’s Deus Ex: Human Revolution, and definitely fell far short of expectations, given the five year long development cycle that Makind Divided went through. And unfortunately, it looks like the Deus Ex series will be paying the price for this failure.
Of course, this doesn’t mean that Deus Ex is done for forever- Square Enix may choose to revive it some day in the future, much like they did with Human Revolution in the first place. But at the same time, given the limbo that franchises like Thief and Legacy of Kain find themselves in, that may not be too likely.
Source: Rheena.com