Yes, Mitsubishi will not have an Evo in the lineup and there is not a replacement planned, testing, confirmed, or anything. A Nissan spokesperson stated, "Mitsubishi Motors does not have any plans to design a successor with the current concept, as a high-performance four-wheel-drive gasoline-powered sedan."
That does not mean the Evo is dead, it just means it will... evolve. Hah, get it? The same spokesperson added that Mitrsubishi would "explore the possibilities of high-performance models that incorporate electric vehicle technology."
What that sounds like to MitsubishiBoost is that the next Evo will be a hybrid. Considering Mitsubishi Motors has made 10 generations of Lancer Evolution they clearly like and know the importance of an enthusiast model in their 'boring' lineup.