This here seems to be the first 10.3" e-reader device with an illuminated screen:
blog.the-ebook-reader.com/2018/04/21/new-jezetek-ebook-readers-includes-first-frontlit-10-3-inch-model-video
Attached screenshot taken from
www.youtube.com/watch?v=n8ETk7EEXTc shows the technical specs. As can be seen in the video, the 10.3" device is indeed illuminated, and the light is turned off during demonstration. The specs don't mention any SD card, OS is Android 4.4.2, and the device appears to have not hardware buttons at all (hard to see).
After the
already available Onyx Boox Note, the upcoming
Boyue Likebook Note (
forum thread), this is now at least the third e-ink reader device featuring a 10.3" display.
Looks like quite a few more chinese companies are trying to join the 10.3" party this year, and those among us who don't really care about a faster CPU might hopefully have some cheaper models to choose from.