Arne Meyer, boss of community, marketing and PR at Naughty Dog took to NeoGAF to state that Graham McTavish, voice of Charlie Cutter and Zoran Lazarevic is not currently working with Naughty Dog. While this comes as a bitter disappointment, it does not preclude the possibility of another Vita title. While I am not sold on this idea quite as much as I was the Uncharted 4 theory it is possible. Sony Bend do use the Naughty Dog mocap stage in Los Angeles. which is where McTavish said he was based. It is getting more and more tenuous, but you never know.
Hope dies last.