The way I understand it everything for Nintendo in KidZone will not affect ET or the Spongebob store/Pizza building. I have no idea if their entrances will change or what, but similar to the leaked layout, these buildings are to remain.
Whether a small walkway is left between construction walls and ET, or they reroute ETs entrance through Hollywood as we've contemplated, I do not know. But the three Nintendo attractions are coming in without that plot needed as far as I know.
I will say also, unlike the leaked concept, DK will be as big as MK as far as footprint, (if not bigger.) And tbh, I'm starting to look forward to it more than anything else in this land.
Things are of course still in flux, and who knows what might change. But so far I'm even more excited than I was a few weeks ago about all of this.