I've been reading on smaller PDAs and smartphones for a decade, but last year finally got a kindle (non touch black). I do love eink, but I'm not a fan of going from a 3.5"-4.7" readers to a 6" reader with massive bezels. I demand both buttons (or something very much like them, Voyage's sensors will probably suffice) and a light. So I did a little mockup of a handier Voyage. Let me know if you find it interesting at all.
In addition to a smaller screen vs the Voyage, I've also chopped off 3 out of the 4 bezels, leaving one to control page turns and hold the device with. A smaller footprint changes the weight distribution in a manner friendlier to one-handed readers. An accelerometer allows the device to be held in either the left or right hand, reorienting the screen accordingly.
I moved the light sensor to the outside edge from the top so that no matter which hand it's being held in, it's getting a more consistent angle on ambient light than if it were being flipped around from top to bottom. There are also two page back buttons so that no matter which hand you use, you can also reach up (or down if you prefer) to turn the page and not have to look for the button.
I suspect that to shrink the footprint this much without losing battery life, the device would have to be thicker, which I welcome. It might also create an opportunity to craft a soft, rounded edge and back, not unlike what Motorola has done with its acclaimed Moto X ergonomics. It should be light, but the Trek need not be anorexic.
I haven't cared much about the Voyage's impressive pixel density. My old basic Kindle's terrible density looks stunningly better than the same density would on a transmissive (LCD, OLED) screen. But that's at relatively large font sizes that work pretty well with how I hold my big kindle. For those of us with young eyes at least, the finer fonts this new tech is capable of rendering could find a nicer showcase in a mini Voyage.