Stephen Dupree, the lead designer of Donkey Kong Country: Tropical Freeze, left Retro two years ago. He spent those two years at Playful Corp working on New Super Lucky's Tale, but now it seems like his time at that studio has wrapped as well.
Reports have come in stating that Dupree has returned to work at Retro, where he should feel right at home. Besides Tropical Freeze, Dupree worked on Donkey Kong Country Returns and Mario Kart 7. This time around, Dupree will be serving as a principle game designer, although we don't know what project he's working on.