iPads with At least 11” screens will get full macOS capability.
Unlikely. An iPad has non-optimal ergonomics and not enough memory or write-friendly storage. It's ether top-heavy, or heavier than laptop because of a weighted keyboard base, or topples over when one pokes at the touchscreen. That's why just the iPad keyboard weighs almost as much as a 12" MacBook.
Now if you take an iPad, but put the heavy battery, circuit boards with more memory and faster storage, and touch sensor in the keyboard area, you end up with a MacBook. So that's far more likely what Apple will do for macOS 11.x.