I now have a Glowlight 3. It looks very much like an upgraded NST, maybe slightly larger due to the size of the bezels. However, it feels very light, and it's a pleasure to hold. The folks at the B&N store tell me that covers will be available in two weeks or so.
The 3 has a total of 8 gb of internal storage. However, after my 3 updated, I saw, in Storage, two partitions listed: one for Nook store content ( about 4.5 gb) and one for sideloaded books (about 0.95 gb). When I plugged the 3 into my Mac, I saw a Nook drive of about 1 gb. That was it. So, sideloading is limited.
By tapping on the Nook icon in Settings-About a number of times, a menu comes up that includes developer options. One can enable USB debugging there. However, when I started Terminal, connected my 3 to my laptop, and typed "adb devices", Terminal saw the device, but also came up with "unauthorized". After some attempts at turning usb debugging off and on again, and trying to deauthorize my computer and reauthorize it, I finally got authorization. Then, one can simply type "adb install .." followed by an apk, from Terminal, and install apps. Install a launcher first, so you can find app icons. I did not try rooting the 3. I just wanted to see if apps can be installed. The 3 is not designed to run apps, so if you go this route, stick with apps that focus on reading and do not make many demands on the hardware.
As a reader, the 3 does a good job. There are two buttons on either side of the display, so you can turn a page back or forward from either side. Text is clear, as you'd expect. There are several font options, and all the common customization choices. There is a slight hesitation from a button click to a page turn. Clicking the buttons makes a sound - for those who care. The display is recessed from the bezel, rather than flush. You can't put a microSD card into the 3.
Feel free to ask questions, if you wish. I'll post more as I learn more about the device.
