The demo I saw showed a guy at a standing desk, using a Magic Keyboard and Magic Trackpad. I remember I grimaced thinking what his shoulders must feel like typing with his hands so close together on that tiny, shitty little keyboard. It made me think of little T-Rex arms.
The keys on the magic keyboard (and therefore hand positions) are no closer together than on other keyboards. It just doesn't have the numeric keypad part.
If you want an ergonomic keyboard with a gap in the middle, any bluetooth keyboard will work with a Mac, iPhone or iPad, so I imagine it would with this too.
Seems like they mentioned t-rex arms which are characteristic of non-ergo keyboards, all of which are generally terrible. I really wish Apple would just make a better version of the Sculpt now that MS is out of that game.