There hasn't been a new DK game in 7 years. I obviously don't count the 3DS port of Returns and the Switch port of Tropical Freeze. Those are releases, but not new games.
I think this year or next is ripe for another DK game. A 2D platformer could be a good idea to finish a second Donkey Kong Country trilogy. But a 3D game would make more sense, as Retro has other obligations (as the rumor mentions. But then again, they're busy with Metroid Prime 4. But what were they working on for over 4 years?
Donkey Kong 64 isn't considered too great of a game, so maybe EPD could make a nearly universally loved 3D DK game. It would also be wise to make the game more accessible to players. DK games are pretty noteworthy for their difficulty.
Lifetime Sales Predictions
Switch: 161 million (was 73 million, then 96 million, then 113 million, then 125 million, then 144 million, then 151 million, then 156 million)
PS5: 122 million (was 105 million, then 115 million) Xbox Series X/S: 38 million (was 60 million, then 67 million, then 57 million. then 48 million. then 40 million)
Switch 2: 120 million (was 116 million)
PS4: 120 mil (was 100 then 130 million, then 122 million) Xbox One: 51 mil (was 50 then 55 mil)
3DS: 75.5 mil (was 73, then 77 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima