@deadman The Air 2 fully supports split view (don't remember if the 4 supports slide over) and SxS isn't only useful for side by side reading. You'll find some use cases here:
http://blog.appstafarian.com/post/146297027803/
I'm afraid you'll have to wait for the day to be over before being able to purchase. As promised, the preview mode turns Marvin into exactly what you'd see after the IAP. Thanks a lot for your support.