It'll never happen, but I really wish we could get an actual height and wingspan measurement.
I argued this last summer he is closer to 6'10'' than 6'8''. Watch videos of him working out with Bamba (measured at 7'1'' at the combine). When they stand upright next to each other, he is closer to 2 inches shorter than 5 inches shorter.
On top of that, I think his wingspan is way bigger than the 6'11'' he was measured at as a Junior in high school. His shoulders are wider than back than and his hands look bigger -- that alone would add multiple inches.
He will end up closer to Giannis and Durant as far as size and athleticism goes.
It's a good thing too, because we need his length to help us on the boards this year.