Looks like something begging to break, very un-apple. Collapsible systems have rarely been reliable or durable. Just look at the old collapsible notebook modem jacks. They were popular for a while and then disappeared because they always broke. I hope apple is taking care not to cheapen there products.
+1. I really liked the Duo system. Obviously a lot has changed since then, but why couldn't apple simply build a machine that docks with special port? If it has wireless, then it hardly needs another jack--perhaps a single USB port for a key drive. That's what makes it ultraportable. If you want more, get the smallest macbook.