Well, herrrrumph, I of course don't have my Voyage yet - sulk.
But now, Oberon sent me a photo, excellent customer service, of their cover for the Voyage with the device inside. The cover does indeed extend to a biggish margin all around the edges (hard to say exactly but I'd say about half an inch). They are revamping their site and intend to update their page on various models of Kindles in covers.
I quite like the Omotom map one, seems nice and light and the map looks better in your pics, O Omotom owner (sorry, forgot who posted). But they're not available in the UK.
So I went ahead and took the plunge and re ordered my Orange ForeFront case - which I had cancelled because, like some others here, I thought their sales practices a tad sharp. But, nine reviews rave.
Who knows, perhaps after having placed my order on the 20 Sep, I'll have my Voyage (mispacked at the slightly Orwellian-ly named 'fulfillment centre') in time for Christmas, along with a usable case.
Hope you are all having fun with your devices, and your Kindles