Maybe I'm the buzzkill here, but I'm highly doubtful that Super Nintendo World at USH will have a DK coaster when it opens. I'm not ruling it out as a possibility later on down the line, but based on what we're seeing right now, I'm firmly in the "No DK coaster" camp.
If we use the plans originally filed for Orlando in 2017 as a guide, it appears that the land is approximately seven acres (the permit says 8.8 acres, but the plans look like they also include some Back of House development) and is divided between the central hub, Mushroom Kingdom-themed area, the Mario Kart ride, and the Donkey Kong Coaster. The land currently clear and awaiting development in the Lower Lot is, generously, 3.5 acres. They may move the Transformers extended queue to squeeze out an extra fifth of an acre, but even if they took out that entire center island with Panda Express and folded it in, it wouldn't even add another acre. The deployment of the Height Balloons implies to me that this is pretty much all we're going to get.
So, you've got half the amount of space to work with, so something's got to go. They can't get rid of the main area, because that's where all the shops and the restaurant will be (the real money-makers). So then you have to choose between one of two major rides. I think Universal would choose Mario Kart over DK for a two main reasons: Mario Kart is a more familiar brand than Donkey Kong Country and they'd rather an indoor attraction than an outdoor roller coaster in the middle of a Movie Studio.
I still think it's going to be a beautiful, immersive land. I think the Mario Kart ride will be something truly unprecedented and will be a game changer. As much as I want it to be, I don't think that the Donkey Kong coaster will be a part of the opening line-up of Super Nintendo World at USH.