I think the split keyboard idea is a non-starter. Although it solves the problem of being able to type with your hands far apart, it still means you have to scan your eyes a long distance left and right between the two halves while you type.
The pretend-stylus idea is the best I've seen so far in terms of sheer intuitiveness. And my guess is that Apple will always go for the most immediately intuitive solution, even if something else could be more efficient after enough training. Of course, they might have come up with an even cleverer solution - but either way, I reckon text input is the thing that will make or break the tablet. And I'm sure they are plenty aware of that.
The pretend-stylus idea is the best I've seen so far in terms of sheer intuitiveness. And my guess is that Apple will always go for the most immediately intuitive solution, even if something else could be more efficient after enough training. Of course, they might have come up with an even cleverer solution - but either way, I reckon text input is the thing that will make or break the tablet. And I'm sure they are plenty aware of that.