I'm not really sure what to make of this, it's as though Microsoft plans to not only provide you with a powerful, simplistic handset, but to throw in some Nintendo Wii Remote-type accessories as well if this patent is anything to go by. Should this indeed turn out to be the case, that all future Windows Phone handsets will have a slide-out accessory expansion slot, then it could open up a whole new realm of opportunity.
From the trusty external keyboard that aids typing to a battery extension to a game pad that gives the user an edge in gaming, I'm sure Microsoft has bags of imagination (as anyone would) surrounding this idea. As for me I'm not one to fuss about moving/interchangeable parts as I'm fully aware that hardware wears out. It's one of the reasons why I adore my Samsung Omnia7 - it's just a block with no moving parts (sliding keyboard etc.).
It's interesting to note that the secondary devices (accessories for the smartphones) will be able to work wirelessly without being connected to a handset. Still, I remain skeptical. Let us not forget the integration with Kinect we could be experiencing in the future.
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Rich Edmonds was formerly a Senior Editor of PC hardware at Windows Central, covering everything related to PC components and NAS. He's been involved in technology for more than a decade and knows a thing or two about the magic inside a PC chassis. You can follow him on Twitter at @RichEdmonds.